Partition means to split up a whole into parts.

A part-part-whole model is a pictorial representation that shows the whole and its parts.

A missing part is one of the parts that cannot be seen.

Solve problems finding a missing part when one part and the whole is known

Maths

In this unit pupils will revisit how numbers are represented cardinally and ordinally. They will partition 1 - 5 in different ways and find a missing part. In the future unit pupils will represent numbers 6 - 10 by partitioning in different ways. They will learn what odd and even numbers are and how they can be partitioned. They will identify a missing part when a whole is partitioned into 2 parts

In prior learning, pupils will have explored the composition of numbers to 10 and be able to subitise up to 5. In this unit pupils will partition 1 to 5 in different ways and find a missing part.

Composition of numbers 0 to 5

What is missing – one of the parts or the whole? 

Aisha thinks the missing part will be 3. Is this correct?    

Lucas thinks the missing part will be 5. Is this correct? 

Lucas thinks the missing part will be the same for all of these. Is he correct?

Aisha has clapped 3 times. How many more claps does she need to do to make the whole correct? 

Lucas will nod his head 5 times and has already nodded it twice. Which part-part-whole model is showing this correctly? 

Match the picture to the correct part-part-whole model. 

Which part-part-whole model is showing Aisha’s counters correctly partitioned? 

This lesson will be removed by end of Summer Term 2025.

Solve problems finding a missing part when one part and the whole is known

Lesson outcome

This lesson will be removed by end of Summer Term 2025.