# Calculate the difference

I can calculate the difference and find pairs that have the same difference.

# Calculate the difference

I can calculate the difference and find pairs that have the same difference.

## Lesson details

### Key learning points

- When comparing numbers, we can look at the difference between them.
- The difference between two numbers has a value.
- The difference can be shown as a bar model.
- Difference can be calculated as subtraction.
- Different pairs of numbers can have the same difference.

### Common misconception

Recording a subtraction to show difference incorrectly e.g. knowing that the difference between 4 and 6 is 2, but recording this as 4 - 6 = 2

Stress we can compare 6 to 4 or 4 to 6, but remind children that subtraction is not commutative so the whole (/ the larger number of those being compared) has to be written first in the expression. We can however change the position of the = symbol.

### Keywords

Difference - The result of subtracting one number from another. Way in which two or more things we are comparing are not the same.

Same - Way in which two or more things we are comparing are like each other.

Subtraction - To partition one part from another (the subtrahend from the difference), or to decrease an amount by taking an amount away.

### 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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## Starter quiz

### 6 Questions

3

5

8

0

2

Number of pencils

Numbers of pens

Difference between the number of pencils and the number of pens

## Exit quiz

### 6 Questions

5

6

7

8