Solve problems involving subtraction of two-digit numbers
I can solve problems involving subtraction of two-digit numbers that do not cross the tens boundary.
Solve problems involving subtraction of two-digit numbers
I can solve problems involving subtraction of two-digit numbers that do not cross the tens boundary.
These resources will be removed by end of Summer Term 2025.
Lesson details
Key learning points
- When subtracting a 2-digit number, the known part can be partitioned to subtract the tens and the ones separately.
- Partitioning both the whole and the parts when subtracting gives an correct answer when the ones digits bridge 10
- The tens and ones can be subtracted in any order and the remaining part will stay the same.
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 think that, when partitioned, the tens and ones must be subtracted in the same order as they occur in the two-digit number, e.g. that to subtract 34, you must subtract 30, then 4
Explore subtracting tens and ones in any order at this point, looking at the result of this and considering which they find easier.
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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