# Solve problems involving subtraction when bridging 10

I can solve problems involving subtraction of two-digit numbers that cross the tens boundary.

# Solve problems involving subtraction when bridging 10

I can solve problems involving subtraction of two-digit numbers that cross the tens boundary.

## Lesson details

### Key learning points

- Some problems involving the subtraction of two-digit numbers, can be solved by bridging 10
- We can look to see if the ones digits cross the tens boundary to find out if we must use the bridge 10 strategy

### Common misconception

When subtracting, children may partition the whole and the part, look at the ones digits involved and simply subtract the smaller digit from the larger digit, e.g. solve 75 - 36 as 70 - 30, then 6 - 1

Consider whether or not the equation involved will require the 10 tens boundary to be crossed before solving, referring specifically to subtracting the ones digit from the whole number, e.g. think 75-6 rather than 5 -6

### Keywords

Partition - To split a whole up into parts

Part - A piece or section of a whole

Bridge 10 - An addition or subtraction strategy where numbers are partitioned to reach the previous or next multiple of 10, so bonds to 10 can be used to calculate more efficiently.

### 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

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