Use knowledge of 10 and a bit to solve problems

I can use my knowledge of 10 and a bit to solve problems.

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Year 1

Use knowledge of 10 and a bit to solve problems

I can use my knowledge of 10 and a bit to solve problems.

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Lesson details

Key learning points

The teens numbers can be partitioned into ten and a bit.
Problems can be represented using part-part-whole models, tens frames and sum equations.
The 10 and a bit can be represented in the problem.

Common misconception

Pupils continue to count all when finding the sum instead of counting on from 10 or using their developing fluency with partitioning teen numbers into 10 and a bit.

Provide concrete and pictorial examples where 10 is provided as a group that is hard to separate and count. Continue to emphasise one ten as a group of 10 that does not need to be counted in ones.

Keywords

Partition - The act of splitting an object or value down into smaller parts.
Part - A piece or section of the whole.
Sum - The total when numbers are added together.

Examples in this lesson make use of different types of addition and subtraction problem and include partitioning and reduction contexts. Ensure that any adaptation continues to use a range of structures.

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).