Use efficient methods to solve subtraction equations
I can use efficient methods to solve subtraction equations.
Use efficient methods to solve subtraction equations
I can use efficient methods to solve subtraction equations.
Lesson details
Key learning points
- Consecutive numbers always have a difference of 1
- If the whole and the known part in a subtraction equation are consecutive numbers, the missing part will always be 1
- If the known part in a subtraction equation is 1, the whole and the missing part will be consecutive numbers
- When the ones digits in the whole and the known part are the same, the missing part will be a multiple of 10
Common misconception
When writing equations with consecutive numbers, children may write in the order they are counted , e.g. 56-57 = forwards
Give missing number equations and represent them on part-part-whole models and bar models to consolidate understanding of which numbers in the equation represent the whole and the parts.
Keywords
Consecutive - Numbers which follow each other in order, without gaps.
Difference - The result of subtracting one number from another.
Whole - All of something; complete.
Part - A piece or section of a 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).
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