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 means one of the parts that cannot be seen.

Find 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

Sofia has 3 counters and Jun has 2 counters. Which part-part-whole model correctly shows the parts combining to make the whole?

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

Jun thinks the missing part will be the same for these part-part-whole models. Is he correct?

Sofia thinks the missing part will be the same for these part-part-whole models. Is she correct?

Sofia has 1 counter and Jun has 2 counters. Which part-part-whole model is showing their counters?

Which part-part-whole model is showing Sofia’s objects correctly partitioned?

Which part-part-whole model is showing Jun’s objects correctly partitioned?

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

Find a missing part when one part and the whole is known

Lesson outcome

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