Cross the hundreds boundary when adding and subtracting any 2-digit multiple of 10
I can cross the 100s boundary when adding and subtracting multiples of ten.
Cross the hundreds boundary when adding and subtracting any 2-digit multiple of 10
I can cross the 100s boundary when adding and subtracting multiples of ten.
Lesson details
Key learning points
- When you add and subtract multiples of 10, the ones digit stays the same.
- When you add and subtract multiples of 10, the tens digit and sometimes the 100s digit will change.
- Number facts can help when adding and subtracting multiples of 10
Keywords
Multiple - The result of multiplying a number by another whole number.
100s boundary - The point at which the numbers change into 100s numbers, or from one set of hundreds to another.
Common misconception
Pupils may have difficultly partitioning 10s when crossing the 100s boundary. (e.g. 125 - 40)
Pupils practice adding to/subtracting from multiples of 10 (e.g. 130 - 50) before exploring non-multiples of 10 (e.g. 85 + 30)
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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