# Add and subtract multiples of ten

I can add and subtract multiples of ten.

# Add and subtract multiples of ten

I can add and subtract multiples of ten.

## Lesson details

### Key learning points

- Unitising and known facts help you to add and subtract multiples of ten.
- If 3 + 2 is equal to 5 then 3 tens + 2 tens is equal to 5 tens which is equal to 50
- If 5 - 2 is equal to 3 then 5 tens subtract 2 tens is equal to 3 tens which is equal to 30

### Common misconception

Children may not see the link between adding or subtracting ones and adding or subtracting tens. They may not know how to use known facts to help work out equations using multiples of ten.

Reinforce understanding of unitising by describing groups of objects in ones or tens. Make the link between known facts and equations using multiples of ten explicit. Show it with equipment such as base ten blocks and represent on place value charts.

### Keywords

Add - To find the total, or sum, by combining two or more parts (addends), or to increase an amount by adding another.

Subtract - To partition one part from another (the subtrahend from the difference), or to decrease an amount by taking an amount away.

Multiple of ten - A multiple of 10 is a number which can be made of groups of ten.

### 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

so 5 tens plus 4 tens is equal to 9 tens.

so 1 ten plus 5 tens is equal to 6 tens.

so 2 tens plus 3 tens is equal to 5 tens.

## Exit quiz

### 6 Questions

20 + 20

30 − 20

90 − 40

50 + 20

10 + 10

70 − 40