Add and subtract to and from a 3-digit number bridging 100
I can add and subtract to and from a 3-digit number bridging 100.
Add and subtract to and from a 3-digit number bridging 100
I can add and subtract to and from a 3-digit number bridging 100.
Lesson details
Key learning points
- Addition and subtraction calculations can represent counting on and back over the 100s boundary.
- When you count on in tens, sometimes the 10s digit only changes and sometimes the 100s digit changes.
- When you count back in tens, sometimes the 10s digit only changes and sometimes the 100s digit changes.
Common misconception
Pupils may partition numbers incorrectly when adding or subtracting across a 100s boundary.
Encourage pupils to add or subtract to first the 100s number, using number pairs that total 10 or 100.
Keywords
Bridging - A mental strategy which uses addition or subtraction to cross a number boundary.
Partition - Splitting an object or value down into smaller parts.
100s boundary - The point at which 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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