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27 June, 21:10

Write an expression that can be used to find 4 times 275 using mental math and properties of numbers.

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  1. 27 June, 22:29
    0
    Rough estimate: 4 times 300 = 1200

    Properties of numbers: 4 times (300-25) = 4 times 300 - 4 times 25

    = 1200 - 100

    = 1100 (exact answer)
  2. 27 June, 23:18
    0
    (200*4) + (70*4) + (5*4)
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