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
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)
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.
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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