How can you tell which fractions represent a number that is less than 1% without doing any computation?

Question

0.02/5, 0.2/5, 2/5, 2/50, 2/500

Answer 1

1 % is .01

.02/5 is clearly less than .01
(it is .004)

.2/5 is like .4/10 too big

2/5 even bigger

2/50 like 4/100 like .2/5 too big

2/500 is 4/1000 which is small enough
(.004 again)