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Published bySincere Mayou Modified over 2 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 – – – 9 20 – 8

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30 – – – – 12

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40 – – – – 19

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50 – – – – 24

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60 – – – – 29

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70 – – – – 34

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80 – – – – 39

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90 – – – – 44

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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 – – – – 37

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150 – – – – 99

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250 – – – – 149

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300 – – – – 149

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400 – – – – 199

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500 – – – – 249

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750 – – – – 324

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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 – – – 37

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80 – – – – 36

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70 – – – – 39

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100 – – – – 83

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100 – – – – 89

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200 – – – – 198

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300 – – – – 287

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400 – – – – 298

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500 – – – – 671

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