Calculating within 20
Downloads can take a few minutes, especially for larger files or slower connections.
Threads
Why this why now
This unit applies known facts and explores strategies for adding within ten. Pupils use understanding of commutativity to reorder equations to calculate efficiently. The facts in this unit will then be applied to calculating beyond 20.
Prior knowledge requirements
- Recall number bonds to 10 and 20
- Use mental strategies such as counting on and bridging 10
- Represent calculations with concrete or visual models
Threads
Why this why now
This unit applies known facts and explores strategies for adding within ten. Pupils use understanding of commutativity to reorder equations to calculate efficiently. The facts in this unit will then be applied to calculating beyond 20.
Prior knowledge requirements
- Recall number bonds to 10 and 20
- Use mental strategies such as counting on and bridging 10
- Represent calculations with concrete or visual models
Calculating within 20
In this unit pupils will add 3 addends. They will use a strategy such as finding 2 addends to total 10 or 2 numbers to bridge though 10.
15 lessons in unit
slide decks, worksheet PDFs, quizzes and lesson overviews. You can select individual lessons from the Calculating within 20 unit and download the resources you need, or download the entire unit now. See every unit listed in our primary maths curriculum and discover more of our teaching resources for primary maths programmes.