# Add three addends efficiently by finding two addends that total 10

I can use my knowledge of number pairs to 10 to add three addends efficiently.

# Add three addends efficiently by finding two addends that total 10

I can use my knowledge of number pairs to 10 to add three addends efficiently.

## Lesson details

### Key learning points

- The order of the addends can change and the sum stays the same.
- When adding three addends, it is efficient to first find two addends that sum to 10
- ___ add ___ is equal to 10 Then, 10 add ___ is equal to ___

### Common misconception

If children record incorrectly, they could re-add an addend that has already been used to make a pair to 10

Carefully model how to record thinking, rewriting the new equation inclusive of 10 underneath.

### Keywords

Addends - Any of the numbers that are added together.

Number pairs - Two numbers that sum to make 10

Efficient - Not wasting time or effort. An efficient strategy is one we can carry out easily.

### 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

9

7

5

6

8

+ 6

+ 4

+ 2

+ 5

10

12

18

14

16

greater than 10

less than 10

equal to 10