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Caterpillar calculations. Year 1 - LO To understand addition and subtraction (and that one is the inverse of the other!). 2 + 1 = 3. 3 - 1 = 2. 3 + 2 = 5. 5 - 2 = 3. 4 + 3 = 7 . 7 - 3 = 4 .
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Caterpillar calculations Year 1 - LO To understand addition and subtraction (and that one is the inverse of the other!) Jan Blanthorn-Hazell. Click to activate each sum.
2 + 1 = 3 3 - 1 = 2 Jan Blanthorn-Hazell. Click to activate each sum.
3 + 2 = 5 5 - 2 = 3 Jan Blanthorn-Hazell. Click to activate each sum.
4 + 3 = 7 7 - 3 = 4 Jan Blanthorn-Hazell. Click to activate each sum.