# Halve even 2-digit numbers and multiples of 10

I can halve even 2-digit numbers from 12 to 28 and unitise and apply known facts to halve even multiples of 10

# Halve even 2-digit numbers and multiples of 10

I can halve even 2-digit numbers from 12 to 28 and unitise and apply known facts to halve even multiples of 10

## Lesson details

### Key learning points

- Halving facts to 10 can help to halve 2-digit numbers.
- To halve 2-digit numbers, partition the 2-digit number, halve the tens and the ones, then recombine.

### Common misconception

Incorrectly partitioning and halving odd multiples of 10

Ensure children use representations where they are able to see the partitioning of the number into an even multiple of 10 and 10 more. That way, they can clearly see they are still finding half of 30 for example.

### Keywords

Double / Doubling - To become twice as many / to multiply by two.

Half / Halving - One of two equal parts of a whole. To divide into two equal parts.

Partition - The act of splitting an object or value down into smaller parts.

### 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).

## Video

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## Starter quiz

### 6 Questions

## Exit quiz

### 6 Questions

Half of 6 is equal to 3

Half of 10 is equal to 5

Half of 12 is equal to 6

Half of 8 is equal to 4

Half of 40 is equal to 20

Half of 20 is equal to 10

Half of 60 is equal to 30

Half of 80 is equal to 40