Question

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

Answer 1

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.

Answer 2

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.