Identify a missing part when a whole is partitioned into two parts

I can identify a missing part when a whole is partitioned into two parts.

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Year 1

Identify a missing part when a whole is partitioned into two parts

I can identify a missing part when a whole is partitioned into two parts.

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Lesson details

Key learning points

Numbers can represent measures when a part is missing.
Each of the numbers six to ten can be partitioned into two parts in different ways.
If we know one part we can find the other part.
A bar model can be used to represent the whole number and a missing part.
Knowing about odd and even parts means you know if the missing part is odd or even.

Common misconception

Children may confuse the part and the whole, or add the whole and one part to find the missing part.

Encourage the use of the stem sentence ___ is the whole, ___ is a part and ___ is a part, to reinforce what the numbers represent.

Keywords

Partition - To split a whole up into parts.
Whole - All of something. Complete.
Part - A piece or section of a whole.

Part-part-whole models can continue to be used to record and justify answers to problems. Use part-part-whole models in different orientations and with different numbers of parts for children to use to see objects partitioned in different ways.

Teacher tip

Licence

This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).