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16 November, 13:59

Let 40 x 55 = n. Which of the choices shown is also equal to n?

A) (550 x 40)

B) (4 x 50) + (40 x 5)

C) (50 x 40) + (50 x 40)

D) (10 x 55) + (10 x 55) + (10 x 55) + (10 x 55)

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  1. 16 November, 14:37
    0
    D) (10 x 55) + (10 x 55) + (10 x 55) + (10 x 55)

    use distributive rule to factor out 55:

    55 (10+10+10+10) = 55*40
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