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.
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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.
To help you plan your year 3 maths lesson on: Solve problems by adding and subtracting to or from 3-digit numbers, download all teaching resources for free and adapt to suit your pupils' needs...
To help you plan your year 3 maths lesson on: Solve problems by adding and subtracting to or from 3-digit numbers, download all teaching resources for free and adapt to suit your pupils' needs.
The starter quiz will activate and check your pupils' prior knowledge, with versions available both with and without answers in PDF format.
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The assessment exit quiz will test your pupils' understanding of the key learning points.
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Explore more key stage 2 maths lessons from the Representing 3-digit numbers, comparing and positioning on number lines unit, dive into the full secondary maths curriculum, or learn more about lesson planning.
Licence
Lesson video
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Starter quiz
6 Questions
Exit quiz
6 Questions
