Package 4-3: Which one doesn’t belong?

This task offers your child the opportunity to practise using addition and subtraction and supports their understanding of this inverse relationship.

Week 5 - Package 3 - Year 5 and 6 Mathematics - Which one doesn’t belong?

Things you need

Have these things available so your child can complete this task.

Ideal

Back up

Read the instructions about Super shapes.

Why is this activity important?

This task offers your child the opportunity to practise using addition and subtraction and supports their understanding of this inverse relationship. It encourages them to explain and share their thinking. Super shapes also helps your child become familiar with the idea of representing a number using a symbol (in this task, a shape).

Before you start

Make sure your child has the required resources ready.

Check that the video is working and the audio settings are correct for your child.

What your child needs to know and do

Your child needs to know in this task numbers are represented by different shapes.

What to do next

View Super shapes

Your child follows the instructions detailed on Activity Sheet 1.

They may need to use paper to record their thinking and to help them revise their thinking.

Options for your child

Activity too hard?

Ask your child to take some time to think and then describe what they notice and know.

Encourage them to write down their thinking and reaffirm to them that mathematicians revise and reorganise their thinking to help them make sense of their ideas.

Encourage your child to watch the video again. They may like another opportunity to think about the mathematical ideas explored in the video.

Activity too easy?

Spend time discussing the strategies used whilst solving the problems. Encourage your child to think about other ways to find a solution?

Follow-up questions to ask your child

  • Where might you start?

    • Why?

  • What do the other shapes add up to in each case?

  • Now that we know that shape, how will that help?

  • How did you solve this problem?

  • What does that tell us?

    • How do we know?

  • How are you recording your thinking?

  • What did you find challenging?

    • How did you overcome that challenge?

Extension/Additional activity

Ask your child to create their own Super shapes problem using these shapes.

Your child could also create their own Super shapes problems using other shapes or objects.

You can find out more about Super shapes at NRICH from Cambridge University.

Activity sheet 1: Super shapes

(From NRICH maths)

Each of the following shapes has a value:

=7 =17

The value of the red shapes changes in each of the following problems.

Can you discover its value in each problem, if the values of the shapes are being added together?

(a) =25

(b)

orange rectanglegreen triangle
green triangle
red oval

=51

(c)

green triangle
green triangle
red pentagonred pentagonorange rectangleorange rectangle

=136

(d)

red right angled trianglered right angled trianglered right angled triangle

=48

(e)

green triangle
red thin ovalgreen triangle
orange rectanglegreen triangle
red thin ovalgreen triangle

=100


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