Order the fractions from least to greatest, 1/6 2/5 3/5 3/7

The higher the denominator, the smaller the parts.  For example, the following five fractions are in order from least to greatest: 
 

However, when ordering  , you may notice that the second of those two has a higher numerator.  In this particular case, that means that  is the smallest of the fractions given. 

Since there are only two different denominators left now, it is easiest to make the demoninators the same. 
2 X 7 = 14
5 X 7 = 35
3 X 7 = 21

3 X 5 = 15
7 X 5 = 35

The remaining fractions are  
Those three fractions are actually 

Therefore, in order of smallest to largest, the fractions are 

If you divide 0.1 and 0.6 you wii get 0.166666 which rounds to .167 which is answer b