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.
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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.
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.
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.
To help you plan your year 3 maths lesson on: Add and subtract to and from a 3-digit number bridging 100, download all teaching resources for free and adapt to suit your pupils' needs...
To help you plan your year 3 maths lesson on: Add and subtract to and from a 3-digit number bridging 100, download all teaching resources for free and adapt to suit your pupils' needs.
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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.
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Starter quiz
6 Questions
Exit quiz
6 Questions
