Jan Blanthorn-Hazell. Click to activate Jan Blanthorn-Hazell. Click to activate each sum.each sum. 11

Caterpillar calculationsCaterpillar calculationsYear 1 - LO To understand Year 1 - LO To understand

addition and subtraction (and that addition and subtraction (and that one is the inverse of the other!)one is the inverse of the other!)

22Jan Blanthorn-Hazell. Click to activate Jan Blanthorn-Hazell. Click to activate

each sum.each sum.

2 + 1 = 3

3 - 1 = 2

33Jan Blanthorn-Hazell. Click to activate Jan Blanthorn-Hazell. Click to activate

each sum.each sum.

3 + 2 = 53 + 2 = 5

5 - 2 = 35 - 2 = 3

44Jan Blanthorn-Hazell. Click to activate Jan Blanthorn-Hazell. Click to activate

each sum.each sum.

4 + 3 = 7 4 + 3 = 7

7 - 3 = 4 7 - 3 = 4