# Explain how adjusting one part affects the sum

I can explain how adjusting one addend or part affects the sum or whole.

# Explain how adjusting one part affects the sum

I can explain how adjusting one addend or part affects the sum or whole.

## Lesson details

### Key learning points

- If I increase this part or by __ then the whole will increase by the same amount.
- If I decrease this part by __ then the whole will decrease by the same amount.
- A balance beam can represent unequal expressions or inequalities.

### Common misconception

Many pupils understand the equals symbol as 'makes' or a the symbol you simply place in front of the answer. This can make the idea of a balanced equation tricky, undoing concepts like adjustment.

Get all the pupils to write an expression (as unique as possible) that is equal to 10 and display them in the classroom. Ask the children what symbol could be placed between all of them and explore why.

### Keywords

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

Adjustment - An adjustment is a change to a number using either subtraction or addition. This can be done to a part or a whole.

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

Part - A part is some 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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