Year 1 · Mathematics and statistics · Number
Adding and subtracting to 20
Facts to 10, doubles and halves, making ten, adding and subtracting within 20, and simple story problems.
Everything for this topic in one place
- 3D lesson: Adding and subtracting to 20 — Put apples in a basket, watch birds fly away, make 10 on a ten frame, find doubles and add ten.
- Teacher presentation — slides to put on the projector.
- Worksheets at three levels — Tūī (support), Kererū (core) and Kea (extension), each with an answer key on the last page.
- Online practice — assign it to your class in the Crateclass classroom and the results come back by themselves.
Written for Te Mātaiaho, Phase 1 (Years 0–3), with New Zealand places, money and native birds.
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See a full 3D lesson, a game and printable worksheets with no account on the free samples page. Teachers who sign up by 18 December 2026 get everything free until 9 April 2027.
More Year 1 maths topics
Numbers to 100 · Equal groups · Halves and quarters · New Zealand money · Patterns and number sentences · Measuring and time · Shapes and position · Picture graphs and data