Practice Quiz

GMAT Math Practice Test #1

Category - Math

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If the number 1/6, 2/9, 1/18, 1/12, and 2/3 were ordered from greatest to least, the middle number of the resulting sequence would be

  1. 1/6
  2. 2/9
  3. 1/18
  4. 1/12
Explanation

Answer: A

Before comparing fractions, their denominators should be made same. The denominators 6, 9, 18, 12 and 3 have LCM = 36. We convert the fractions all with 36 as denominator.

6/36, 8/36, 2/36, 3/36, 24/36

Now arrange the series from greatest to lowest value of their numerators:

24/36, 8/36, 6/36, 3/36, 2/36

The middle number of the resulting sequence is 6/36 = 1/6

Key takeaway: Before comparing fractions, their denominators should be made same. Then arrange the series in ascending order as per the numerators.

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