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+/- Numbers Year 2-3 – Addition and subtraction of two-digit numbers
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= 77 40 + 4 70 + 7
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= 89 50 + 8 80 + 9
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= 72 40 + 6 60 + 12
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= 62 40 + 4 50 + 12
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= 70 40 + 3 60 + 10
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= 44 40 + 4
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= 58 50 + 8
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= 46 60 10+ 40 + 6
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= 44 50 10+ 40 + 4
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= 43 60 10+ 40 + 3
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= 84 Adding by counting forwards on a number line
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= 71 Adding by counting forwards on a number line
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= 82 Adding by counting forwards on a number line
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= 70 Adding by counting forwards on a number line
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= 84 +10 +10 +10 +10 +1 43 53 63 73 83 84 Adding by counting forwards on a number line
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= 84 +40 +1 43 83 84 Adding by counting forwards on a number line
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= 71 +10 +1 +1 +1 +1 +1 56 66 67 68 69 70 71 Adding by counting forwards on a number line
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= 71 +10 +4 +1 56 66 70 71 Adding by counting forwards on a number line
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= 82 +10 +10 +1 +1 +1 +1 58 68 78 79 80 81 82 Adding by counting forwards on a number line
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= 82 +20 +2 +2 58 78 80 82 Adding by counting forwards on a number line
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= 70 +10 +10 +10 +1 +1 38 48 58 68 69 70 Adding by counting forwards on a number line
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= 70 +30 +2 38 68 70 Adding by counting forwards on a number line
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= 43 Adding by counting forwards on a number line
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7 1 – 1 5 = 56 Adding by counting forwards on a number line
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= 58 Adding by counting forwards on a number line
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= 38 Adding by counting forwards on a number line
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= 43 -1 -10 -10 -10 -10 43 44 54 64 74 84 Adding by counting forwards on a number line
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= 43 -1 -40 43 44 84 Adding by counting forwards on a number line
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7 1 – 1 5 = 56 -1 -1 -1 -1 -1 -10 56 57 58 59 60 61 71 Adding by counting forwards on a number line
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7 1 – 1 5 = 56 -4 -1 -10 56 60 61 71 Adding by counting forwards on a number line
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= 58 -1 -1 -1 -1 -10 -10 58 59 60 61 62 72 82 Adding by counting forwards on a number line
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= 58 -2 -20 -2 58 60 62 82 Adding by counting forwards on a number line
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= 38 -1 -1 -10 -10 -10 38 39 40 50 60 70 Adding by counting forwards on a number line
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= 38 -2 -30 38 40 70 Adding by counting forwards on a number line
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= 84 = 84 84 43 41 = 43 = 41
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7 1 – 1 5 = 56 = 15 71 56 15 = 71 = 71
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5 8 + 2 4 = 82 = 82 82 24 58 = 58 = 24
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- 3 2 = 7 0 38 = 32 70 32 38 = 70 = 70
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= 84 +10 +10 +10 +10 +1 43 53 63 73 83 84 = 43 84 43 41 Adding by counting forwards on a number line -1 -10 -10 -10 -10 43 44 54 64 74 84
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7 1 – 1 5 = 56 -1 -1 -1 -1 -1 -10 56 57 58 59 60 61 71 = 71 71 56 15 +10 +1 +1 +1 +1 +1 56 66 67 68 69 70 71
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___ = 5 8 82 82 24 ? 58 = 58 -1 -1 -1 -1 -10 -10 58 59 60 61 62 72 82
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___ = 7 0 38 ? 70 32 38 = 70 +10 +10 +10 +1 +1 38 48 58 68 69 70
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