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Published bySincere Mayou Modified over 10 years ago
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ADDING UP
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CATEGORY 1 Adding Up strategy : The whole number is a multiple of ten or one hundred. The subtrahend is close to a multiple of ten or a landmark number.
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20 – 15 20 – 14 20 – 9 20 – 8
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30 – 24 30 – 19 30 – 15 30 – 12
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40 – 34 40 – 29 40 – 24 40 – 19
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50 – 44 50 – 39 50 – 29 50 – 24
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60 – 54 60 – 49 60 – 39 60 – 29
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70 – 59 70 – 49 70 – 39 70 – 34
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80 – 69 80 – 59 80 – 49 80 – 39
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90 – 79 90 – 74 90 – 49 90 – 44
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100 – 89 100 – 74 100 – 49 100 – 44
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CATEGORY 2 Adding Up strategy : The whole number is a multiple of ten or one hundred. The subtrahend is close to a multiple of ten or a landmark number.
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100 – 89 100 – 69 100 – 49 100 – 37
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150 – 124 150 – 149 150 – 124 150 – 99
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250 – 224 250 – 219 200 – 199 200 – 149
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300 – 269 300 – 249 300 – 99 300 – 149
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400 – 349 400 – 299 400 – 274 200 – 199
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500 – 449 500 – 419 500 – 299 500 – 249
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750 – 709 750 – 599 750 – 449 750 – 324
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1000 – 899 1000 – 749 1000 – 624 1000 – 499
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CATEGORY 3 Adding Up strategy : The whole number is NO longer an exact multiple of ten or one hundred. The subtrahend is farther distance from the whole.
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50 – 29 50 – 48 50 – 37
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80 – 59 84 – 59 81 – 48 81 – 36
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70 – 49 73 – 49 76 – 67 76 – 39
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100 – 75 120 – 75 125 – 75 125– 83
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100 – 80 140 – 80 146 – 80 146– 89
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200 – 149 250 – 149 223 – 186 245– 198
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300 – 174 315 – 174 335 – 219 335– 287
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400 – 329 420 – 329 423 – 318 444 – 298
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500 – 249 525 – 249 1000 – 499 1000 – 671
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