1) 67 + 39 a) 67 + 40 = 107 → take away 2 → 105 b) 67 + 40 = 107 → take away 1 → 106 c) 67 + 30 = 97 → add 8→ 105 2) 56 + 29 a) 56 + 20 = 76 → add 9 → 85 b) 56 + 30 = 86 → take away 1 → 85 c) 56 + 30 = 86 → take away 3 → 83 3) 72 + 48 a) 72 + 50 = 122 → take away 2 → 120 b) 72 + 40 = 112 → add 8 → 120 c) 72 + 50 = 122 → take away 1 → 121 4) 84 + 37 a) 84 + 40 = 124 → take away 3 → 121 b) 84 + 30 = 114 → add 6 → 120 c) 84 + 40 = 124 → take away 2 → 122 5) 65 + 28 a) 65 + 30 = 95 → take away 2 → 93 b) 65 + 20 = 85 → add 7 → 92 c) 65 + 30 = 95 → take away 3 → 92 6) 93 + 19 a) 93 + 20 = 113 → take away 1 → 112 b) 93 + 10 = 103 → add 9 → 112 c) 93 + 20 = 113 → take away 2 → 111 7) 46 + 38 a) 46 + 40 = 86 → take away 2 → 84 b) 46 + 40 = 86 → take away 3 → 83 c) 46 + 30 = 76 → add 6 → 82 8) 78 + 42 a) 78 + 40 = 118 → add 2 → 120 b) 78+ 50 = 128 → take away 8 → 120 c) 78 + 40 = 118 → add 3 → 121 9) 57 + 33 a) 57 + 30 = 87 → add 3 → 90 b) 57 + 40 = 97 → take away 7 → 90 c) c) 57 + 30 = 87 → add 2 → 89 10) 69 + 41 a) 69 + 40 = 109 → add 1 → 110 b) 69 + 50 = 119 → take away 9 → 110 c) 69 + 40 = 109 → add 2 → 111

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