# Explain how to balance equations with subtraction expressions

I can explain how to balance equations with subtraction expressions.

# Explain how to balance equations with subtraction expressions

I can explain how to balance equations with subtraction expressions.

## Lesson details

### Key learning points

- If the minuend and subtrahend are changed by the same amount, the difference stays the same.
- If you increase or decrease the minuend, the difference increases or decreases by the same amount.
- If you increase the subtrahend then the difference decreases.
- If you decrease the subtrahend then the difference increases.

### Common misconception

Pupils immediately calculate expressions instead of considering the relationship between expressions.

Take time to model interrogation of values within expressions, identifying relationships between them. Encourage this reasoning and show how it can be more efficient than calculation especially in situations with larger values.

### Keywords

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

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

Expression - An expression contains one or more values, where each value is separated by an operator.

### 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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