# Use known facts and mental strategies to calculate with decimal numbers within and across a whole

I can use known facts and mental strategies to calculate with decimal numbers within and across a whole.

# Use known facts and mental strategies to calculate with decimal numbers within and across a whole

I can use known facts and mental strategies to calculate with decimal numbers within and across a whole.

## Slide deck

## Lesson details

### Key learning points

- If you know that 5 + 2 is equal to 7 then 5 tenths + 2 tenths is equal to 7 tenths so 0.5 + 0.2 = 0.7
- Use known facts and unitising to add tenths.
- Bridging 10 strategies with whole numbers can be applied when the tenths bridge one whole.

### Common misconception

Pupils record missing part equations incorrectly.

Encourage children to match the equation to a representation identifying which number represents the wholes and which represent parts.

### Keywords

Number facts - Simple calculations using two numbers are known as number facts. For example 2 + 4 = 6

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

### 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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