# Use a balanced equation to calculate unknown parts

You can use a balanced equation to calculate unknown parts.

# Use a balanced equation to calculate unknown parts

You can use a balanced equation to calculate unknown parts.

## Lesson details

### Key learning points

- I've added __ to this part so I need to subtract __ from the other part to keep the sum the same.
- I've subtracted __ from this part so I need to add __ to this part to keep the sum the same.
- A balance beam can represent equivalent expressions.

### Common misconception

Often, pupils understand the equals symbol to be a big reveal or a 'ta-da!' rather than a symbol denoting equivalence. This can make the idea of a balanced equation tricky.

Explore pupils' understanding of the equal sign at the start of the lesson. For children who still find it a tricky concept, make use of bucket scales and plasticine to explore equivalence.

### Keywords

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. Two or more expressions with the same value can be separated by an equals sign to create an equation.

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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