4.2 homework answers 5th grade

Envision Math Grade 5 Answer Key | Envision Math 5th Grade Textbook Answers

Envision math 5th grade textbook answer key | envision math grade 5 answers.

Envision Math Grade 5 Answers Topic 1 Numeration

• Topic 1.1 Place Value
• Topic 1.2 Comparing and Ordering Whole Numbers
• Topic 1.3 Decimal Place Value
• Topic 1.4 Comparing and Ordering Decimals
• Topic 1.5 Problem Solving
• Topic 1 Test Prep
• Topic 1 Reteaching

Envision Math 5th Grade Answer Key Topic 2 Addition and Subtraction Number Sense

• Topic 2.1 Mental Math
• Topic 2.2 Rounding Whole Numbers and Decimals
• Topic 2.3 Estimating Sums and Differences
• Topic 2.4 Adding and Subtracting
• Topic 2.5 Adding Decimals
• Topic 2.6 Subtracting Decimals
• Topic 2.7 Problem Solving
• Topic 2 Test Prep
• Topic 2 Reteaching

Envision Math Grade 5 Answer Key Topic 3 Reviewing Multiplication of Whole Numbers

• Topic 3.1 Multiplication Properties
• Topic 3.2 Estimating Products
• Topic 3.3 Multiplying by 1-Digit Numbers
• Topic 3.4 Multiplying by 2-Digit Numbers
• Topic 3.5 Estimating and Multiplying with Greater Numbers
• Topic 3.6 Exponents
• Topic 3.7 Problem Solving
• Topic 3 Test Prep
• Topic 3 Reteaching

Envision Math 5th Grade Textbook Answers Topic 4 Division of Whole Numbers

• Topic 4.1 Using Patterns to Divide
• Topic 4.2 Estimating Quotients
• Topic 4.3 Connecting Models and Symbols
• Topic 4.4 Dividing by 1-Digit Divisors
• Topic 4.5 Zeros in the Quotient
• Topic 4.6 Dividing by 2-Digit Divisors
• Topic 4.7 More Dividing by 2-Digit Divisors
• Topic 4.8 Division: Estimating and Dividing with Greater Numbers
• Topic 4.9 Problem Solving
• Topic 4 Test Prep
• Topic 4 Reteaching

Envision Math 5th Grade Textbook Answer Key Topic 5 Variables and Expressions

• Topic 5.1 Variables and Expressions
• Topic 5.2 Patterns and Expressions
• Topic 5.3 More Patterns and Expressions
• Topic 5.4 Distributive Property
• Topic 5.5 Order of Operations
• Topic 5.6 Problem Solving
• Topic 5 Test Prep
• Topic 5 Reteaching

Envision Math Grade 5 Online Textbook Topic 6 Multiplying Decimals

• Topic 6.1 Multiplying Decimals by 10, 100, or 1,000
• Topic 6.2 Multiplying a Whole Number and a Decimal
• Topic 6.3 Estimating the Product of a Whole Number and a Decimal
• Topic 6.4 Multiplying Two Decimals
• Topic 6.5 Multiplying with Zeros in the Product
• Topic 6.6 Problem Solving
• Topic 6 Test Prep
• Topic 6 Reteaching

5th Grade Envision Math Answers Topic 7 Dividing Decimals

• Topic 7.1 Dividing Decimals by 10, 100, or 1,000
• Topic 7.2 Dividing a Decimal by a Whole Number
• Topic 7.3 Estimation: Decimals Divided by Whole Numbers
• Topic 7.4 Dividing a Decimal by a Decimal
• Topic 7.5 Problem Solving
• Topic 7 Test Prep
• Topic 7 Reteaching

Envision Math Answer Key Grade 5 Topic 8 Shapes

• Topic 8.1 Basic Geometric Ideas
• Topic 8.2 Measuring and Classifying Angles
• Topic 8.3 Polygons
• Topic 8.4 Triangles
• Topic 8.5 Quadrilaterals
• Topic 8.6 Problem Solving
• Topic 8 Test Prep
• Topic 8 Reteaching

Scott Foresman Addison Wesley Envision Math Grade 5 Answers Topic 9 Factors and Multiples

• Topic 9.1 Understanding Factors
• Topic 9.2 Prime and Composite Numbers
• Topic 9.3 Finding Prime Factors
• Topic 9.4 Common Factors and Greatest Common Factor
• Topic 9.5 Problem Solving
• Topic 9 Test Prep
• Topic 9 Reteaching

Pearso n Envision Math Grade 5 Answer Keys Topic 10 Fractions, Mixed Numbers, and Decimals

• Topic 11.1 Adding and Subtracting Fractions with Like Denominators
• Topic 11.2 Common Multiples and LCM
• Topic 11.3 Adding Fractions with Unlike Denominators
• Topic 11.4 Subtracting Fractions with Unlike Denominators
• Topic 11.5 Adding Mixed Numbers
• Topic 11.6 Subtracting Mixed Numbers
• Topic 11.7 Problem Solving
• Topic 11 Test Prep
• Topic 11 Reteaching

Pearson Math Grade 5 Answer Keys Topic 11 Adding and Subtracting Fractions and Mixed Numbers

• Topic 10.1 Meaning of Fractions
• Topic 10.2 Fractions and Division
• Topic 10.3 Mixed Numbers and Improper Fractions
• Topic 10.4 Equivalent Fractions
• Topic 10.5 Comparing and Ordering Fractions and Mixed Numbers
• Topic 10.6 Fractions in Simplest Form
• Topic 10.7 Tenths and Hundredths
• Topic 10.8 Thousandths
• Topic 10.9 Fractions and Decimals on the Number Line
• Topic 10.10 Problem Solving
• Topic 10 Test Prep
• Topic 10 Reteaching

Pearson Education Answer Key Math 5th Grade Topic 12 Multiplying and Dividing Fractions and Mixed Numbers

• Topic 12.1 Multiplying Fractions and Whole Numbers
• Topic 12.2 Multiplying Two Fractions
• Topic 12.3 Dividing a Whole Number by a Fraction
• Topic 12.4 Dividing Two Fractions
• Topic 12.5 Problem Solving
• Topic 12.6 Multiplying Mixed Numbers
• Topic 12.7 Dividing Mixed Numbers
• Topic 12.8 Problem Solving
• Topic 12 Test Prep
• Topic 12 Reteaching

Envision Math Grade 3 Answers Topic 13 Length, Perimeter, and Area

• Topic 13.1 Using Customary Units of Length
• Topic 13.2 Using Metric Units of Length
• Topic 13.3 Perimeter
• Topic 13.4 Area of Squares and Rectangles
• Topic 13.5 Area of Parallelograms
• Topic 13.6 Area of Triangles
• Topic 13.7 Problem Solving
• Topic 13 Test Prep
• Topic 13 Reteaching

Envision Math 5th Grade Answer Key Topic 14 Solids

• Topic 14.1 Solids
• Topic 14.2 Relating Shapes and Solids
• Topic 14.3 Surface Area
• Topic 14.4 Views of Solids
• Topic 14.5 Models and Volume
• Topic 14.6 Volume
• Topic 14.7 Problem Solving
• Topic 14 Test Prep
• Topic 14 Reteaching

Envision Math Grade 3 Answer Key Topic 15 Integers

• Topic 15.1 Understanding Integers
• Topic 15.2 Comparing and Ordering Integers
• Topic 15.3 Integers and the Number Line
• Topic 15.4 Adding Integers
• Topic 15.5 Subtracting Integers
• Topic 15.6 Simplifying Expressions
• Topic 15.7 Problem Solving
• Topic 15 Test Prep
• Topic 15 Reteaching

Envision Math 5th Grade Textbook Answers Topic 16 Solving and Writing Equations

• Topic 16.1 Solving Addition and Subtraction Equations
• Topic 16.2 Solving Multiplication and Division Equations
• Topic 16.3 Problem Solving
• Topic 16.4 Patterns and Equations
• Topic 16.5 More Patterns and Equations
• Topic 16.6 Problem Solving
• Topic 16 Test Prep
• Topic 16 Reteaching

Envision Math 5th Grade Textbook Answer Key Topic 17 Percent

• Topic 17.1 Understanding Ratios
• Topic 17.2 Understanding Percent
• Topic 17.3 Percents, Fractions, and Decimals
• Topic 17.4 Finding Percent of a Whole Number
• Topic 17.6 Problem Solving
• Topic 17 Test Prep
• Topic 17 Reteaching

Envision Math Grade 5 Online Textbook Topic 18 Equations and Graphs

• Topic 18.1 Ordered Pairs
• Topic 18.2 Line Graphs
• Topic 18.3 Graphing Equations
• Topic 18.4 Problem Solving
• Topic 18 Test Prep
• Topic 18 Reteaching

5th Grade Envision Math Answers Topic 19 Graphs and Data

• Topic 19.1 Bar Graphs and Picture Graphs
• Topic 19.2 Histograms
• Topic 19.3 Circle Graphs
• Topic 19.4 Make a Graph
• Topic 19.5 Mean
• Topic 19.6 Median, Mode, and Range
• Topic 19.7 Outcomes
• Topic 19.8 Writing Probability as a Fraction
• Topic 19.9 Problem Solving
• Topic 19 Test Prep
• Topic 19 Reteaching

Envision Math Answer Key Grade 5 Topic 20 Constructions

• Topic 20.1 Constructing Angles
• Topic 20.2 Constructing Lines
• Topic 20.3 Constructing Shapes
• Topic 20.4 Problem Solving
• Topic 20 Test Prep
• Topic 20 Reteaching

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Texas Go Math Grade 5 Lesson 4.2 Answer Key Divide Decimals by Whole Numbers

Refer to our Texas Go Math Grade 5 Answer Key Pdf to score good marks in the exams. Test yourself by practicing the problems from Texas Go Math Grade 5 Lesson 4.2 Answer Key Divide Decimals by Whole Numbers.

Investigate

Materials; decimal models; color pencils

B. You need to share your model among __________ equal groups.

C. Since 2 wholes cannot be shared among 4 groups without regrouping, cut your model apart to show the tenths. There are ______ tenths in 2.4. Share the tenths equally among the 4 groups. There are ______ ones and ______ tenths in each group. Write a decimal for the amount in each group.

Draw Conclusions

Math Talk Mathematical Processes

What other manipulatives or models could you use to solve this problem? Answer: Base 10 model Explanation: You can also use base 10 blocks method to model the division of a decimal by the whole number

Make Connections

You can also use base-ten blocks to model the division of a decimal by a whole number.

Materials; base-ten blocks

Kyle has a roll of ribbon 3.21 yards long. He cuts the ribbon into 3 equal lengths. How long is each piece of ribbon?

Divide. 3.21 ÷ 3

STEP 2: Share the ones. Share an equal number of ones among 3 groups. There is __________ one(s) shared in each group and _________ one(s) left over.

STEP 4: Share the hundredths. Share the 21 hundredths equally among the 3 groups. There are _________ hundredth(s) shared in each group and _________ hundredth(s) left over. So, each piece of ribbon is __________ yards long. Answer:

STEP 2: Share the ones. Share an equal number of ones among 3 groups. There is 3 one(s) shared in each group and 0 one(s) left over.

STEP 4: Share the hundredths. Share the 21 hundredths equally among the 3 groups. There are 21 hundredth(s) shared in each group and 0 hundredth(s) left over. So, each piece of ribbon is 1.07 yards long.

Explain why your answer makes sense. Answer: When 3,21 is divided 3 the answer is 1.07 Explanation: The sharing is to be done by division.

Share and Show

Use the model to complete the number sentence.

Question 4. Multi-Step Sam can ride his bike 4.5 kilometers in 9 minutes, and Amanda can ride her bike 3.6 kilometers in 6 minutes. Which rider might go farther in 1 minute? Answer: 0.5 > 0.6 Explanation: Sam can ride his bike 4.5 kilometers in 9 minutes is 0.5 Amanda can ride her bike 3.6 kilometers in 6 minutes. is 0.6 so, 0.5 is greater than 0.6 Sam can ride faster in one minute

Question 5. H.O.T. Explain how you can use inverse operations to find 1.8 ÷ 3. Answer: 1.8 ÷ 3 =0.6 Explanation: To find the inverse operation we have to find the multiplicati on So, inverse operation for the equation is ____÷ 3 = 0.6

Daily Assessment Task

Fill in the bubble completely to show your answer.

Question 6. Multi-Step Yesterday, a bamboo plant was 12.62 yards tall. Today, the bamboo had grown by 0.34 yard. Bryson chopped the bamboo into 6 equal pieces. How long was each piece? (A) 21.6 yd (B) 0.216 yd (C) 2.16 yd (D) 216 yd Answer: C Explanation: The total length of the bamboo tree is 12.63+0.34=12.94, Bryson chopped the bamboo tree into 6 equal parts 12.94÷6= 2.16 each piece was 2.16 long

Question 8. Multi-Step Marvyn worked for 3 days. He earned $87.20 each day. He uses his earnings to buy four chairs. If he has no money left over, what is the cost of each chair? (A) $65.40 (B $261.60 (C) $116.27 (D) $21.80 Answer: D Explanation: Marvyn worked for 3 days. He earned $87.20 each day. He uses his earnings to buy four chairs. If he has no money left over, The cost of each chair is $21.80

$87.30÷4=$21.80

Texas Test Prep

Go Math Lesson 4.2 5th Grade Answer Key Question 9. A bag of oranges costs $7.65. Five friends want to share the bag. How much will each friend pay? (A) $38.25 (B) $1.53 (C) $2.00 (D) $1.13 Answer: B Explanation: A bag of oranges costs $7.65. Five friends want to share the bag. $1.53 should each friend pay $7.65 ÷ 5 = $1.53

Texas Go Math Grade 5 Lesson 4.2 Homework and Practice Answer Key

Explanation: There are 2 one(s), 4  tenth(s), and 8 hundredth(s). Shared an equal number of ones among 4 groups. There is 2 one(s) cannot be shared in each group and 2 one(s) left over. There are 24  tenth(s) can be shared in each group and 0 tenth(s) left over. Share the 8 hundredths equally among the 4 groups. There are 8 hundredth(s) shared in each group and 0 hundredth(s) left over.

Explanation: There are 2 one(s), 8 tenth(s), and 0 hundredth(s). Shared an equal number of ones among 4 groups. There are 2 one(s) that cannot be shared in each group and 2 one(s) left over. There are 28  tenth(s) that can be shared in each group and 0 tenth(s) left over. Each group get 7 tenth parts equally

Explanation:

Question 5.There are 3  one(s), 5  tenth(s), and 4 hundredth(s). Shared an equal number of ones among 3 groups. There is 3 one(s) shared in each group and 0 one(s) left over. There are 5  tenth(s) can be shared in each group and 2 tenth(s) left over. 2 tenths cannot be regrouped so, done to hundredths Share the 24 hundredths equally among the 3 groups. There are 24 hundredth(s) shared in each group and 0 hundredth(s) left over.

Explain how you can use the whole number expression 248 ÷ 4 to check that your answer to Exercise 2 is reasonable. Answer: Yes

Explanation: There are 2 one(s), 4  tenth(s), and 8 hundredth(s). Shared an equal number of ones among 4 groups. There is 2 one(s) cannot be shared in each group and 2 one(s) left over. There are 24  tenth(s) can be shared in each group and 0 tenth(s) left over. Share the 8 hundredths equally among the 4 groups. There are 8 hundredth(s) shared in each group and 0 hundredth(s) left over. Used a whole number expression 248 ÷ 4= 62 This is reasonable

Problem Solving

Question 6. Mrs. Tillman builds furniture. She saws a maple board that is 4.56 meters long into 4 equal lengths. She saws an oak board that is 3.69 meters long into 3 equal lengths. Which is longer, a piece of oak or a piece of maple? Explain. Answer: 1.14 and 1.23

Explanation: Mrs. Tillman builds furniture. She saws a maple board that is 4.56 meters long into 4 equal lengths. That is 1.14 She saws an oak board that is 3.69 meters long into 3 equal lengths. That is 1.23 A piece of oak is longer

Question 7. Drew has a video game with five different challenges. He sets the timer to play his game for 10.75 minutes. He spends the same amount of time playing each challenge. How long does Drew play the fifth challenge? Answer: 2.15 minutes Explanation: Drew has a video game with five different challenges. He sets the timer to play his game for 10.75 minutes. He spends the same amount of time playing each challenge. So, 10.75 ÷ 5= 2.15 he plays the fifth challenge for 2.15 minutes

Lesson Check

Question 8. Karina places concrete blocks along one side of her garden. The length of the border is 3.6 meters. If she uses 9 concrete blocks, what is the length of 1 block? (A) 0.3 meter (B) 0.9 meter (C) 0.04 meter (D) 0.4 meter Answer: D Explanation: Karina places concrete blocks along one side of her garden. The length of the border is 3.6 meters. If she uses 9 concrete blocks, The length of 1 block is 0.4 meters

Go Math Grade 5 Lesson 4.2 Homework Answer Key Question 9. Max used base-ten blocks to solve the division problem 12.15 ÷ 3. Which set of blocks shows the quotient for 12.15 ÷ 3? (A) 4 ones, 5 tenths, 0 hundredths (B) 4 ones, 0 tenths, 5 hundredths (C) 0 ones, 4 tenths, 5 hundredths (D) 5 ones, 0 tenths, 4 hundredths Answer: B Explanation: 4 ones, 0 tenths and 5 hundredths show the quotient for 12.53 which is divided by 3

Question 11. Mr. Jefferson gives his two children $5.46 to spend at the garage sale. If they split the money evenly, how much will each child have to spend? (A) $1.82 (B) $1.23 (C) $2.23 (D) $2.73 Answer: D Explanation: Mr. Jefferson gives his two children $5.46 to spend at the garage sale. If they split the money evenly,  Each child has to spend $2.73

Question 12. Multi-Step Mrs. Gonzales decorates the perimeter of her rectangular bulletin board with ribbon. She cuts a ribbon 3.72 yards long in half to decorate the top and the bottom. She cuts a ribbon 2.6 yards long in half to decorate the two sides. How much shorter is one side ribbon than the top ribbon? (A) 0.56 yard (B) 0.5 yard (C) 0.66 yard (D) 0.6 yard Answer: 1.86 and  1.3 = 0.56 (A) Explanation: Mrs. Gonzales decorates the perimeter of her rectangular bulletin board with ribbon. She cuts a ribbon 3.72 yards long in half to decorate the top and the bottom. That is 1.86 She cuts a ribbon 2.6 yards long in half to decorate the two sides. That is 1.3 1.86 – 1.3 = 0.56 yard shorter is one side ribbon than the top ribbon

Question 13. Multi-Step Tamilca bought 6 fish at the pet store for a total of $7.26. If two of the fish together cost $4.10, and each of the other four fish had the same cost, how much was each remaining fish? (A) $1.21 (B) $2.05 (C) $0.79 (D) $3.16 Answer: C Explanation: Tamilca bought 6 fish at the pet store for a total of $7.26. If two of the fish together cost $4.10, 7.26 – 4.10 = 3.16 and each of the other four fish had the same cost, 3.16÷ 4 = $0.79 The remaining fish cost each is $0.79

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Go Math! Florida 5th Grade, Grade: 5 Publisher: Houghton Mifflin Harcourt

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Eureka Math Grade 5 Module 2 Lesson 4 Answer Key

Engage ny eureka math 5th grade module 2 lesson 4 answer key, eureka math grade 5 module 2 lesson 4 problem set answer key.

Answer: 16 x 29 = 464.

Answer: 38 x 45 = 1710.

Answer: 74 x 59 = 4366.

Answer: 19 x 25 = 475.

Explanation: In the above-given question, given that, 20 twenty-fives – 1 twenty-five. 20 x 25 – 1 x 25. 500 – 25. 475

b. 24 × 11 = _____eleven_____ twenty-fours

Think: ___10__ twenty fours + __1___ twenty four = ( ____10______ × 24) + ( ____1______ × 24) = _____240_____ + _____24_____ = __264________

Answer: 10 x 24 = 264.

c. 79 × 14 = _____79_____ fourteens

Think: _____78_____ fourteens – 1 fourteen = (_____78_____ × 14) – (_____1_____ × 14) = ____1092______ – ___14_______ = ____1078______

Answer: 79 x 14 = 79 fourteens.

d. 21 × 75 = ______21____ seventy-fives

Think: ___20__ seventy-fives + __1___ seventy-five = (____20______ × 75) + (_____1_____ × 75) = ___1500_______ + ____75______ = ___1625_______

Answer: 21 x 75 = 1625.

Question 3. Define the unit in word form and complete the sequence of problems as was done in the lesson. a. 19 × 15 = 19 ___15_______

Think: 20 _______15______ – 1 ____15_________ = (20 × _____15_____) – (1 × __15________) = ___300_______ – _____15_____ = _____285_____

Answer: 19 x 15 = 285.

Explanation: In the above-given question, given that, 20 fifteens – 1 fifteen. 20 x 15 – 1 x 15. 500 – 15. 285.

b. 14 × 15 = 14 ____15______

Think: 10 _____5_______ + 4 ______10_____ = (10 × ____5______) + (4 × ____10______) = _____50_____ + ____40______ = ___90_______

Answer: 14 x 15 = 210.

Explanation: In the above-given question, given that, 10 5 + 4 10. 50 + 40. 90

c. 25 × 12 = 12 _____25_____

Think: 10 ____15______ + 2 __25_______ = (10 × ___25_______) + (2 × _____25_____) = ____250______ + _____50_____ = ____300______

Answer: 25 x 12 = 300.

Explanation: In the above-given question, given that, 10 fifteens + 2 twenty-five. 10 x 15 + 2 x 25. 250 + 50. 300.

d. 18 × 17 = 18 ___17_______

Think: 20 ____17______ – 2 ____17______ = (20 × _____17_____) – (2 × ___17_______) = ______340____ – ____34______ = ____306______

Answer: 18 x 17 = 306.

Explanation: In the above-given question, given that, 20 seventeen – 2 seventeen. 20 x 17 – 2 x 17. 340 – 34. 306.

Question 4. How can 14 × 50 help you find 14 × 49?

Answer: 14 x 50 = 14 x (50 – 1).

Explanation: In the above-given question, given that, 14 fifty – 14 fourty nine. 14 x 50 – 14 x 49. 700 – 686. 14

Question 5. Solve mentally. a. 101 × 15 = __1515________

Answer: 101 x 15 = 1515.

Explanation: In the above-given question, given that, 101 x 15 1515.

b. 18 × 99 = ____1782______

Answer: 18 x 99 = 1782.

Explanation: In the above-given question, given that, 18 x 99 1782.

Question 6. Saleem says 45 × 32 is the same as (45 × 3) + (45 × 2). Explain Saleem’s error using words, numbers, and/or pictures.

Answer: 45 x 32 = 1440  and (45 x 3) + (45 x 2) = 135 + 90 = 225..

Explanation: In the above-given question, given that, 45 x 32 1440.

Question 7. Juan delivers 174 newspapers every day. Edward delivers 126 more newspapers each day than Juan. a. Write an expression to show how many newspapers Edward will deliver in 29 days.

Answer: The newspapers Edward will deliver in 29 days =

Explanation: In the above-given question, given that, Juan delivers 174 newspapers every day. Edward delivers 126 more newspapers each day than Juan. 174 + 126 = 300. Edward will deliver in 29 days = 300 x 29. 300 x 29 = 8700.

b. Use mental math to solve. Show your thinking.

Eureka Math Grade 5 Module 2 Lesson 4 Exit Ticket Answer Key

Solve using mental math. Draw a tape diagram and fill in the blanks to show your thinking.

a. 49 × 11 = ____49______ elevens

Think: 50 elevens – 1 eleven

= (___50_______ × 11) – (_____1_____ × 11) = ____550______ – _____11_____ = _____539_____

Answer: 49 x 11 = 539.

b. 25 × 13 = ____13______ twenty-fives

Think: __10___ twenty-fives + __3___ twenty-fives = (____10______ × 25) + (____3______ × 25) = ____250______ + ____75______ = _____325_____

Answer: 25 x 13 = 325.

Eureka Math Grade 5 Module 2 Lesson 4 Homework Answer Key

Answer: 37 x 19 = 703.

Answer: 26 x 35 = 910

Answer: 34 x 89 = 3026

Answer: 19 x 50 = 950.

Explanation: In the above-given question, given that, 19 x 50 20 x 50 – 1 x 50. 1000 – 50. 950.

b. 11 × 26 = ____11______ twenty-sixes

Think: __10___ twenty-sixes + __1___ twenty-six = ( _____10_____ × 26) + ( ___1_______ × 26) = _____260_____ + _____26_____ = _____234_____

Answer: 11 x 26 = 234.

c. 49 × 12 = ______49____ twelves

Think: ___50__ twelves – 1 twelve = ( ____50______ × 12) – ( ____1______ × 12) = ____600______ – _____12_____ = ____588______

Answer: 49 x 12 = 588.

d. 12 × 25 = ______12____ twenty-fives

Think: ___10__ twenty-fives + __2___ twenty-fives = ( ____10______ × 25) + ( ____2______ × 25) = _____250_____ + ____50______ = ____300______

Answer: 12 x 25 = 300.

Question 3. Define the unit in word form and complete the sequence of problems as was done in the lesson. a. 29 × 12 = 29 ____12______

Think: 30 _____12_____ – 1 ____12______ = (30 × ______12____ ) – (1 × _____12_____ ) = ____360______ – ___12_______ = ____348______

Answer: 29 x 12 = 348.

Explanation: In the above-given question, given that, 29 x 12 30 x 12 – 1 x 12. 360 – 12. 348.

b. 11 × 31 = 31 __11________

Think: 30 _____11_____ + 1 _____11_____ = (30 × ___11_______ ) + (1 × ___11_______ ) = _______330___ + ____11______ = _____341_____

11 x 31 = 341.

Explanation: In the above-given question, given that, 11 x 31 30 x 11 + 1 x 11. 330 + 11. 341.

c. 19 × 11 = 19 _____11_____

Think: 20 ____11______ – 1 ______11____ = (20 × ___11_______ ) – (1 × ____11______ ) = ____220______ – ___11_______ = ____209______

d. 50 × 13 = 13 ____50______

Think: 10 _____50_____ + 3 _____50_____ = (10 × ____50______ ) + (3 × ____50______ ) = ___500_______ + ____150______ = ____650______

Answer: 13 x 50 = 650.

Explanation: In the above-given question, given that, 13 x 50 10 x 50 + 3 x 50. 500  + 150. 650.

Question 4. How can 12 × 50 help you find 12 × 49?

Answer: 12 x 50 = 600.

Explanation: In the above-given question, given that, 12 x 49 = 12 x (50 – 1). 12 x 49  = 588. 12 x 50 = 600.

Question 5. Solve mentally. a. 16 × 99 = ___1584_______

Answer: 16 x 99 = 1584.

Explanation: In the above-given question, given that, 16 x 99. 1584.

b. 20 × 101 = ___2020_______

Answer: 20 x 101 = 2020.

Explanation: In the above-given question, given that, 20 x 101 20 x 102 – 1. 20 x 101. 2020.

Question 6. Joy is helping her father to build a rectangular deck that measures 14 ft by 19 ft. Find the area of the deck using a mental strategy. Explain your thinking.

Answer: The area of the deck = 266 sq ft.

Explanation: In the above-given question, given that, Joy is helping her father to build a rectangular deck that measures 14 ft by 19 ft. area = l x b. area = 14 x 19. area = 266 sq ft.

Question 7. The Lason School turns 101 years old in June. In order to celebrate, they ask each of the 23 classes to collect 101 items and make a collage. How many total items will be in the collage? Use mental math to solve. Explain your thinking.

Answer: The total items will be in the college = 2323.

Explanation: In the above-given question, given that, The Lason School turns 101 years old in june. In order to celebrate, they ask each of the 23 classes to collect 101 items and make a collage. 23 x 101 = 2323.

CPM Educational Program

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• Core Connections Integrated I, 2013
• Core Connections Algebra 1, 2013
• Core Connections Geometry, 2013
• Core Connections Algebra 2, 2013
• Core Connections Integrated I, 2014
• Core Connections Integrated II, 2015
• Core Connections: Course 1
• Core Connections: Course 2
• Core Connections: Course 3
• Core Connections Integrated III, 2015

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