# Solve problems by adding and subtracting to or from 3-digit numbers

I can solve problems by adding to and subtracting from 3-digit numbers.

# Solve problems by adding and subtracting to or from 3-digit numbers

I can solve problems by adding to and subtracting from 3-digit numbers.

## Slide deck

## Lesson details

### Key learning points

- Number lines can record the steps in our thinking when we are partitioning to add and subtract.
- The 1s digit does not change when you add or subtract a multiple of ten.
- Number facts to 10 help when crossing the 10s and 100s boundaries.

### Common misconception

Pupils may struggle to partition 10s numbers to help them bridge a 100s boundary.

Encourage pupils to calculate the number of tens needed to add or subtract to the 100s number, then add or subtract the remainder.

### Keywords

Bridge - Bridging is a strategy which uses addition or subtraction to cross a number boundary.

Partition - Partition means splitting an object or value down into smaller parts.

100s boundary - The 100s boundary is the point at which the numbers change into 100s numbers, or from one set of hundreds to another.

### 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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