Solve problems by adding and subtracting to or from 3-digit numbers
I can solve problems by adding to and subtracting from 3-digit numbers.
Solve problems by adding and subtracting to or from 3-digit numbers
I can solve problems by adding to and subtracting from 3-digit numbers.
These resources will be removed by end of Summer Term 2025.
Lesson details
Key learning points
- Number lines can record the steps in our thinking when we are partitioning to add and subtract.
- The 1s digit does not change when you add or subtract a multiple of ten.
- Number facts to 10 help when crossing the 10s and 100s boundaries.
Keywords
Bridge - Bridging is a strategy which uses addition or subtraction to cross a number boundary.
Partition - Partition means splitting an object or value down into smaller parts.
100s boundary - The 100s boundary is the point at which the numbers change into 100s numbers, or from one set of hundreds to another.
Common misconception
Pupils may struggle to partition 10s numbers to help them bridge a 100s boundary.
Encourage pupils to calculate the number of tens needed to add or subtract to the 100s number, then add or subtract the remainder.
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
Exit quiz
6 Questions
