Question

which is the least ...0.105 0.501 0.015 0.15

Answer 1

the least is 0,015

hope this will help you 

Answer 2

To figure out the least we have to look at the tenths place
(the number to the right of the decimal)
Well lets take a look
0.105
0.501
0.015
0.15 

Within the bolded numbers, which one is the least?
That would be 0.015 <- see?

So the answer is 0.015 

Good luck! :)