# Explain what happens when you add and subtract ten to a multiple of ten

I can explain what happens when you add and subtract ten to a multiple of ten.

# Explain what happens when you add and subtract ten to a multiple of ten

I can explain what happens when you add and subtract ten to a multiple of ten.

## Lesson details

### Key learning points

- Ten can be added to or subtracted from a multiple of ten.
- When you add ten to a multiple of ten the tens number increases by one
- When you subtract ten from a multiple of ten the tens number decreases by one
- If 3 + 1 is equal to 4 then 3 tens + 1 ten is equal to 4 tens which is equal to 40

### Common misconception

Children may not see the link between adding ones and adding tens. They may add or subtract one instead of ten or muddle addition and subtraction, so may subtract ten instead of add ten to a number.

Reinforce understanding of unitising by describing each group of objects in ones or tens, e.g. five cubes plus 1 cube, 5 tens plus 1 ten and talk through what is happening. Show this with equipment in tens and ones such as straws or cubes.

### Keywords

Increase - Make something bigger (in size or quantity).

Decrease - Make something smaller (in size or quantity).

Multiple - A multiple is the result of multiplying a number by another whole number.

### 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

50

70

80

10

30 + 10 = 40

10 + 50 = 60

40 + 10 = 50

60 + 10 = 70