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

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

The notion of creating original maths problems 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 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. 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.

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.

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.

KS3 maths topic intersection for problem solving

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…

  1. Start with any whole number:
    • If the number is even, half it
    • If the number is odd, triple it and then add one
  2. Take your answer, then repeat step 1 (ie either half it or triple it and add one).
  3. Continue until you think you have seen a pattern
Credit: https://xkcd.com/710/

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 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 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

Download a free algebra worksheet of mixed factorising questions

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 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 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.

Do you have students who need extra support in maths?
Every week Third Space Learning’s maths specialist tutors support thousands of students across hundreds of schools with weekly online 1-to-1 lessons and maths interventions designed to plug gaps and boost progress.

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Andy Brighouse
Andy Brighouse
Maths Teacher and Author
Andy has 14 years experience working in education; teaching maths to KS3-KS5, including those with special educational needs. He is the author of "Promoting Mathematical Curiosity", which delves into the key aspects of finding interesting problems for classroom based maths, and he has also co-authored international research on the use of technology in maths pedagogy.
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Downloadable resource

Factorising worksheet

Download a free algebra worksheet of mixed factorising questions

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Factorising worksheet

Downloadable resource

Download a free algebra worksheet of mixed factorising questions

Download Free Now!