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25 August, 08:10

Which number produces a rational number when multiplied by 0.5? A. Pi B. 2.020020002 ... C. squareroot 7 D. 2.22

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  1. 25 August, 09:09
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    It's D, because it's a rational number and "rational * rational = rational", while "rational * irrational = irrational" and the other three numbers are all irrational ones.
  2. 25 August, 11:00
    0
    2.22, when multiplied by 0.5, results in 1.11.

    1.11, in turn, can be written as 111/100, which is a rational number.

    D is the correct answer choice.
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