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Math Strategies

By Zoe

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Place value

100+230+24=

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100+200 = 300

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30 +24= 54

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300 + 54= 354

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Rounding and compensating

34 + 369= 403

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Add 1 more number to 369 = 370

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370 + 33 = 403

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Compatible numbers

33 + 109 +27 +91 =

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33 + 109 +27 +91 =

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109 + 91= 200

33+27 = 60

200+60= 260

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