GMAT Math Practice Test #1

Answer A- Look at the denominator and think how to covert it in 1000 .If multiply both numerator and denominator by 4, you get 62 x 4/1000 = 248/1000 = 0.248

Key takeaway: One way may be to go for straight arithmetic calculation But the question may require long calculation It may waste time and also chances of committing error would be more . So always first look for a way to attack such problems other way such as multiplying or dividing both numerator and denominator by a common number.