# Solve calculations with missing parts

I can solve addition calculations with missing parts.

# Solve calculations with missing parts

I can solve addition calculations with missing parts.

## Lesson details

### Key learning points

- The change in the sum is equal to the change in the missing addend.
- To calculate the missing addend, the known addend must be subtracted from the sum.
- A bar model can be used to represent a calculation with a missing addend.

### Common misconception

The children might be inclined not to look at previous equations to help them. They might not make use of the adjustments to the whole.

Practise some really simple versions. Start with 1 + 2 = 3 and then ask them to adjust 3 by a single-digit number. Write this underneath and then ask them which part has changed and by how much? How do they know?

### Keywords

Equation - An equation is used to show that one number, calculation or expression is equal to another.

Unknown - An unknown is a quantity that has a set value but it is represented by a symbol or letter.

Whole - The whole is all the parts or everything, the total amount.

Part - A part is a piece or section of the whole.

### 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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