# Solve addition calculations mentally by using known facts

I can solve addition calculations mentally by using known facts.

# Solve addition calculations mentally by using known facts

I can solve addition calculations mentally by using known facts.

## Lesson details

### Key learning points

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

### Common misconception

Pupils may find it hard to understand that recalculating the adjusted part is an unnecessary step.

Display two sets of workings side-by-side. In the 1st, show the adjusted part being recalculated. In the 2nd, show it without recalculating the part. Pupils will hopefully see that the solution emerges from both.

### 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.

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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