Represent the inverse relationship between addition and subtraction
I can interpret and represent the inverse relationship between addition and subtraction.
Represent the inverse relationship between addition and subtraction
I can interpret and represent the inverse relationship between addition and subtraction.
Lesson details
Key learning points
- Addition is the inverse of subtraction. Addition can 'undo' subtraction.
- Subtraction is the inverse of addition. Subtraction can 'undo' addition.
- When an amount is added to the start of a story, to 'undo' the change we must subtract the same amount.
- When a given amount is subtracted from the start of a story, to 'undo' the change we must add the same amount.
Common misconception
Children may look at the numbers but not be able to visualise the context, for example, they may try to undo 6 + 4 = 10 with 10 - 6 = 4
Use practical equipment to illustrate the importance of the number added and subtracted being the same. Link equations to contexts ensuring that children are secure with what each part of an equation represents when linked to a story context.
Keywords
Add - o find the total, or sum, by combining two or more parts (addends), or to increase an amount by adding another.
Subtract - To partition one part from another (the subtrahend from the difference), or to decrease an amount by taking an amount away.
Inverse - Inverse means the opposite in effect; the reverse of.
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
8 − 2 = 6
8 − 6 = 2
Exit quiz
6 Questions
