Solve equations involving the subtraction of two-digit numbers
I can solve equations involving the subtraction of two-digit numbers.
Solve equations involving the subtraction of two-digit numbers
I can solve equations involving the subtraction of two-digit numbers.
These resources will be removed by end of Summer Term 2025.
Lesson details
Key learning points
- The known part can be partitioned into tens and ones before subtracting to help subtract two-digit numbers.
- Known facts and the partitioning of numbers can be used to help solve missing number equations.
Keywords
Partition - To split a whole up into parts - a piece or section of a whole.
Part - A piece or section of a whole.
Common misconception
Children may partition both the whole and the parts when subtracting two 2-digit numbers. They need to know to avoid this because it gives an incorrect answer when subtracting numbers which bridge 10
You may wish to explore further examples which do and do not reach the correct answer, articulating why this is the case and coming to the generalisation that, when subtracting, only one part needs to be partitioned into tens and ones.
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).
Lesson video
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Starter quiz
6 Questions
The ones digit will change from 7 to 3
The tens digit will change from 7 to 3
47 − 30 − 2 = ?
47 − 3 − 20 = ?
47 − 5 − 30 = ?
Exit quiz
6 Questions
89 − 51
69 − 37
75 − 15
