Adding and taking away · Usually met around P1
Adding and taking away within 18
From “Add or take away?” to “4 × 4 sudoku”, step by step, each skill with its methods, worked examples and answers.
Skills in this topic, easy to hard
- Add or take away?Put together: add. Taken away or compared: take away
- Number bonds to 10Know each pair that makes 10 on sight
- Adding within 10Add 1–3: count on. More: use pairs to 10
- Zero+ 0 or − 0: no change. Minus itself: 0
- Subtracting within 10Ask: what adds on to get there?
- Fact familiesKnow one, write the family's four
- The equals sign means “the same as”Work out each side; true only if they match
- DoublesKnow every double without thinking
- Near doublesOne apart: double, then add 1
- Making tenMake 10 first, then add what's left
- Subtracting through tenTake it down to 10, then take the rest
- Adding 9 and 8+9: add 10, take 1 back (+8: take 2)
- 4 × 4 sudokuCross out what its row, column and box have
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