area problem solving ks3

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Key Stage 3 - Geometry

Standard KS3.G.1.1 - Calculate the area and perimeter of rectangles and squares with word problems.

Included Skills:

Geometry and measures • Pupils should be taught to: - derive and apply formulae to calculate and solve problems involving: perimeter and area of triangles, parallelograms, trapezia, volume of cuboids (including cubes) and other prisms (including cylinders) - calculate and solve problems involving: perimeters of 2-D shapes (including circles), areas of circles and composite shapes - draw and measure line segments and angles in geometric figures, including interpreting scale drawings - derive and use the standard ruler and compass constructions (perpendicular bisector of a line segment, constructing a perpendicular to a given line from/at a given point, bisecting a given angle); recognise and use the perpendicular distance from a point to a line as the shortest distance to the line - describe, sketch and draw using conventional terms and notations: points, lines, parallel lines, perpendicular lines, right angles, regular polygons, and other polygons that are reflectively and rotationally symmetric - use the standard conventions for labelling the sides and angles of triangle ABC, and know and use the criteria for congruence of triangles - derive and illustrate properties of triangles, quadrilaterals, circles, and other plane figures [for example, equal lengths and angles] using appropriate language and technologies - identify properties of, and describe the results of, translations, rotations and reflections applied to given figures - identify and construct congruent triangles, and construct similar shapes by enlargement, with and without coordinate grids - apply the properties of angles at a point, angles at a point on a straight line, vertically opposite angles - understand and use the relationship between parallel lines and alternate and corresponding angles - derive and use the sum of angles in a triangle and use it to deduce the angle sum in any polygon, and to derive properties of regular polygons - apply angle facts, triangle congruence, similarity and properties of quadrilaterals to derive results about angles and sides, including Pythagoras' Theorem, and use known results to obtain simple proofs - use Pythagoras' Theorem and trigonometric ratios in similar triangles to solve problems involving right-angled triangles - use the properties of faces, surfaces, edges and vertices of cubes, cuboids, prisms, cylinders, pyramids, cones and spheres to solve problems in 3-D - interpret mathematical relationships both algebraically and geometrically.

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Visual maths worksheets, each maths worksheet is differentiated and visual.

KS3 Area and Perimeter Worksheets

Maths Worksheets / KS3 Area and Perimeter Worksheets

Area of Non-Right Angled Triangles

Area of Quadrilaterals (A)

Area of Right Angled Triangles

Compound Shapes (A)

Tiling Problems (A)

Area and Circumference

Area of 2D shapes

Area of Circles

Area of Quadrilaterals (B)

Area of Trapezia (A)

Area of Trapezia (B)

Circle Area Problems

Circumference

Compound Shapes (B)

Solving Equations Involving Area of Rectangles

Area of Sectors and Arc Lengths

Finding the Radius or Diameter

Surface Area of Cones and Spheres

Surface Area of Prisms

The Formulae for Area of Sectors and Arc Lengths

Area of Sectors and Segments

Area of Sectors and Segments (With Clues)

Area of Triangles (With Clues)

Printable Area and Perimeter Worksheets With Answers

Why is learning about area and perimeter important.

Calculating perimeters and areas is an important skill which is used by many people in their everyday lives.

Architects, engineers and construction workers will need precise measurements of area and perimeter in order to construct a building to the right specification. It is not just professionals that need a solid knowledge of area and perimeter; knowing the area of a room can help work out how much paint or flooring is needed to fill the space when redecorating.

Improve Students’ Problem Solving Skills

Regularly practicing area and perimeter questions with children can help them develop good problem solving and logic skills.

The importance of these skills should not be underestimated, as these skills are useful for their learning in other subjects, as well as preparing them for the workplace.

Worksheets Make Learning Area and Perimeter Enjoyable

Children start learning about perimeters and areas in KS2, so it is important to use area and perimeter materials which make the topic easy to understand and enjoyable for them.

Worksheets with fun activities help children learn about this important area of maths. Using good quality resources throughout their education will prepare children for more advanced area and perimeter questions, such as calculating areas of compound shapes and areas of sectors.

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Area and Perimeter

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Resources you can trust

Area challenge

This area of 2D shapes activity is a general review and revision task for either for KS3 or for Foundation GCSE maths. Students need to work backwards from area to find lengths on a square, triangle, parallelogram, two trapezia and a circle.

Other than the circle, all lengths and areas are integers and answers are included.

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Area and Perimeter

This SMILE resource contains three packs of games, investigations, worksheets and practical activities supporting the teaching and learning of area and perimeter, from calculating area by counting squares to finding the formula for the area of a trapezium.

Area and Perimeter pack one  contains fourteen work cards with a wide variety of activities covering finding areas by counting squares, finding the length of perimeters by counting, developing the formula for the area of a rectangle, drawing different shapes with a given perimeter, finding different shapes with a given area and finding the area of simple compound shapes.

Area and Perimeter pack two  contains eleven work cards with activities requiring students to make shapes of a given size using pentominoes, investigate the area and perimeter of rectangles, find the area of a right-angled triangle, calculate the area of polygons drawn on square dotted paper, investigate different ways of shading half a square, find the area of a triangle, find the area of compound shapes made from rectangles and find the area of a parallelogram.

Area and Perimeter pack three  contains eleven work cards with activities in which students investigate the connections between the area of a parallelogram and the area of a rectangle, the area of obtuse-angled triangles, further parallelogram problems, finding the area of a polygon, finding the area of a trapezium and calculating the area of irregular shapes.

SMILE (Secondary Mathematics Individualised Learning Experiment) was initially developed as a series of practical activities for secondary school students by practising teachers in the 1970s. It became a complete individualised scheme based around a network of activity cards and assessments. Related resources include answers  to all of the cards and test books and answers .

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KS3: Area and Perimeter of a Rectangle

Subject: Mathematics

Age range: 11-14

Resource type: Lesson (complete)

Last updated

7 September 2018

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Creating Maths Problems At KS3 Doesn’t Have To Be Hard: How To Make Yours Fun, Engaging, And Curriculum-Focused

Andy Brighouse

Here we look at how to plan for successful maths problem solving lessons with a range of tried and tested KS3 maths problem solving questions that are fun, engaging and curriculum-focused.

The notion of creating original problem solving maths questions can strike fear deep into the heart of the uninitiated teacher. For some, simply delivering a lesson featuring untried problems is anxiety invoking.

Lessons based solely around maths problem solving activities need planning, and when doing this for the first time it may seem like you are devising a strategic military operation, with your lesson plan resembling the tactical objectives of a dawn raid. However, it doesn’t have to be like this; maths is FUN (that’s why we teach it).

The art of teaching problem solving at key stage 3, and the associated planning, is to focus it on harnessing a particular mathematical strand. Ultimately, your problem solving lessons need to be targeting the skills that are necessary to make learners successful in the future and bridge the gap from primary school to secondary school. You can refresh your memory of KS2 problem solving here . As the teacher your knowledge of GCSE maths  and the problems to be encountered there will feed back into the planning so that the learning attributes gathered during problem solving can feed forward into exam success for the students.

How to teach problem solving

Understanding how to get students solving problems (especially those unfamiliar, thought provoking and often slightly perplexing word problems) can be usefully reduced to getting students to consider just two questions…

• “ What do I know? ”  
•  “ What do I need? ”

These two questions are useful for us as educators too (think data driven planning), but here we are going to explore how to use them to drive forward our students’ ability and desire to find some solutions.

How to link problem solving to the national curriculum

Your first task is to think carefully about which strand of maths you want the problem to originate from. All strands of maths are intrinsically linked, but if you’ve recently worked through an algebra unit, focus your maths problem there.

Students can call upon skills from other strands but their immediate thinking should be related to recent learnings or you will swiftly trigger their cognitive overload . Always consider cognitive load theory in the classroom when designing activities.

Don’t force a topic or real life context to fit a strand of maths; consider the skills you want students to draw upon, and think about which sorts of numeracy questions would use those skills.

How to structure a problem solving session

Any problem solving session should commence with a hook; this could be a starter related to the problem at hand or a contextual discussion about why the problem is interesting. Once you have devised a problem, attempt it yourself; this will show you what resources you need, and also the general thought processes and pitfalls your students are going to face.

It’s often a good idea to base your activities around topics that you know very well, and ones that you are confident your students have the relevant skills to be successful. Feel free to delay a particular lesson you have an idea for until you are comfortable with the subject matter. Do some research and practise; this should be enjoyable because maths is FUN. You’ll learn lots of new things, and become an even better teacher in the process.

Curriculum maths problems

To get you started there follows some suggestions of the types of maths problems and approaches you can take in each of the main maths curriculum areas. You will clearly need to adjust your approach, and perhaps provide more or less differentiation and support at each stage depending on the age group you are teaching. But with the right support you’ll be amazed how far students will get in trying to answer these maths questions if they feel sufficiently motivated.

Number and place value maths problems

Number theory is exciting. We know that, but our students don’t always, and it’s never too soon to introduce them to it. The plethora of conjectures, although fiendishly difficult to prove, are mostly based on concepts met at Key Stage 3.

Number problem example: Collatz conjecture

One of my “go to” examples of this would be the Collatz Conjecture. If you’re not familiar with this problem, I suggest looking it up; there are numerous great resources available suitable for all levels. The premise is quite simple…

• If the number is even, half it
• If the number is odd, triple it and then add one
• Take your answer, then repeat step 1 (ie either half it or triple it and add one).
• Continue until you think you have seen a pattern

The scope for the directions you can take in a lesson by using this problem and trying it out with smaller and larger numbers is enormous. A well structured discussion with quality targeted questioning will conjure the ideas of mathematical algorithms, sequences and patterns, through to the trickier concept of evidence versus proof.

Students can understand the problem easily, it’s straightforward to differentiate for ability and resource development is relatively minimal.

Watch the look on your students’ faces when you tell them that after so many years since its formulation, the Collatz Conjecture still has unclaimed prize money for a proof. This instills the idea that even professional mathematicians struggle at times, and that problem solving is about investigating and building a toolkit of mathematical problem solving strategies.

Geometry maths problems

Problem solving lessons focussed on geometry and mensuration lend themselves to practical activities; grab the coloured paper, scissors, glue and then construct solutions. This is where maths can meet other disciplines, whether it’s engineering, art, architecture or even sport science. The reasons I do this are multiple:

• It demonstrates how applicable maths is to EVERYTHING.
• It teaches students that maths goes beyond the exercise book. Maths is a way of critical thinking and is not “just about doing sums”.
• It allows students to be creative in maths, which accesses more parts of the brain, and can give many students those magical lightbulb moments.

Geometry problem example: Packing boxes

A great idea for a very practical problem solving lesson would be looking at how objects pack into boxes. This could be done using concrete resources  such as tennis balls in various sized boxes, but with planning could involve also converting the problem to two dimensions, using circles with different shape mats to investigate layout configurations.

Students can then be encouraged to compare how the 2D and 3D are dealt with. For teachers wishing to brush up on the theory behind this type of work, we would need to look at the differences between geometry  and topology .

Data handling and probability maths problems

Data handling and probability are far more contemporary than the other strands we teach in school, so I would let the problem solving reflect this; choose very modern problems to focus on. In terms of the real world aspect, data and probability have huge implications regarding human actions.

This indicates that a good hook for the students is to have them use their knowledge of data and probability to solve a human problem.

Think about issues that are big in the news or that are prevalent in other subjects. There are great activities that can be created from issues involving the climate and environment. A well written brief could not only boost the students’ mathematical problem solving skills, but could also lead to the solution of wider problems with the school or local area.

Data handling problem example: Recycling around the school

Why not get your students to solve the school’s recycling problems using maths? Ask your students to analyse the locations and numbers of waste bins and recycling bins around the school site. Automatically, this allows for rehearsal of the concepts from the data handling cycle, but also provides raw data for other problem solving activities linked to the overarching theme.

Students could be asked to consider the probability that upon leaving a canteen with food, they will pass a bin of the necessary type before arriving at their next lesson (whilst following a direct route). The scope here is huge, as the problem solving process includes use of estimation, modelling and mensuration (of distance and time).

Algebra maths problems

Designing problem solving lessons based around algebra  may seem scary, but we are not setting out to prove Fermat’s Last Theorem. Start with the basics; building and using expressions. You could use shapes made from paper, denoting side lengths with variables; as new shapes are created, students use the variables to determine linear expressions for perimeter and quadratic expressions for area (if they have met those concepts). What we are looking for is any activity that allows students to use algebra to generalise.

We now come back to those important questions I mentioned:

“ What do I know? ”  And   “ What do I need to know? ”

Algebra problem example: Definitions and representations using algebra

When it comes to problem solving with algebra, students should build a “tool kit”. I usually begin by asking how we define an even number, an odd number; how do we represent this using algebra?

Then, move on to a square number, one more than a cube number, etc. Students can record their results and create a dictionary of algebraic phrases. Later on, we can use these to look at whether the square of an odd number is always odd, or why the square of an even number is a multiple of four.

Students can use these terms to create and manipulate a variety of polynomial expressions through addition and subtraction. They can go onto form and solve equations through inverse operations and even explore decimal and fractional terms. 

These investigations can use simple or more complex numbers and be tailored to the abilities of your class.

Factorising worksheet

30 Problem Solving Maths Questions, Solutions & Strategies

How to lead a problem solving lesson step by step

For any maths problem, but particularly in your lessons specifically focused on problem solving, students need to be coaxed into realising how much they know about the problem already; combining this with what they need as an outcome should create a journey that contains the steps of a solution.

I’ll use an example to illustrate this.

Problem solving example: Waring’s prime number conjecture

Waring’s prime number conjecture states that every odd number (excluding 1) is a prime or the sum of three primes.

Your students need to know certain things in order to look at this:

• The definition of an odd number
• What a prime number is

Ideally, your starter activity will include some assessment for learning (for more on these see this article on teaching strategies ) and a discussion to bring these ideas to the forefront of your students’ minds.

Save mentioning that this is a named conjecture until the end of the lesson.

A possible line of enquiry could be

 “Which odd numbers less than 50 can be written as the sum of three primes?”

Depending on your class, you may need a more open question, or you may need to scaffold the problem into steps.

Ultimately, as long as students are encouraged to consider what they know about the problem already, and what their objective is, they will be able to actively engage in the problem solving process.

If you’ve taken my advice, you will have already attempted this problem; you know which numbers are tricky and which numbers have several solutions.

 By the way, have you worked out why some numbers have a unique three prime sum and why some don’t? Maybe you should investigate this problem; remember maths is FUN.

If, during an activity, you are asked if/why/how something works and you don’t know; be honest. Students tend to welcome honesty from their teachers. Sit down with the students and try and work it out; this is great for building relationships and encourages a collaborative approach.

It also instills in students that, as mathematicians, we try to solve problems because we don’t yet have all the answers.

Read more: Collaborative Lesson Planning

Reviewing the problem solving process

I now return to my military operation analogy: the mission debrief. Make sure you have plenty of time at the end of problem solving activities for a rich and lively discussion, with all your students involved.

Plan your questions well in advance; I think of my questions when I am having my own attempts at solving the problem. Your questioning strategy should draw out if a solution was found, and how. If a solution eluded everyone, discuss why.

Is a solution possible? Was something else needed? Is an approximate solution the best we could hope for.

It‘s well worth explaining to your students that not all problems have exact solutions; sometimes we have to optimise or estimate as best we can, and that is our solution.

Growing resilience through problem solving

The key thing is to keep reminding your students of the maths skills and strategies they are using. Resilience should build over time as students encounter a wider range of problems and have to deploy their skills in different ways. It is this resilience, and lack of fear, when faced with the unfamiliar that gives students the confidence to pause and think…

• “What do I know?”        
• “What do I need?”

By asking students to consider these two questions, and using your love of maths to inject some fun into the solution process, you can create an environment where students engage with unfamiliar and challenging problems. Your students will become the problem solvers you want them to be.

Students will make mistakes, they will struggle and occasionally they will complain. It is through talking to your students about these difficulties and how to overcome them that they become stronger; this is the idea of a growth mindset .

Discuss what worked, what didn’t, mind-map strategies in groups, incorporate tasks based on collaboration and then next time use competition. As well as improving engagement, your students will adapt to new scenarios with greater ease.

Resources to support problem solving at KS3

If you find that your KS3 students need revision or support in applying any of the topics that your maths problems are investigating, there are free step by step teaching and learning guides available within Third Space Learning’s GCSE maths revision resources as well as other maths resources, such as practice maths questions and downloadable worksheets on topics from factorising to fractions.

Your KS3 students come to you as new recruits; they have a fear of the unknown and may lack confidence. Armed with the ideas in this article, as well as the teaching resources and worksheets available, you will soon find your ability to build them up into problem solving soldiers that can tackle any problem on the mathematical battlefield.

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