How to put 3.002, 3.02, 3.001 greatest to least

From greatest to least you would arrange in this order 3.02, 3.002, 3.001.

3.02 has the two in the hundreds place which is bigger than the 3.002 where the 2 is in the thousands place. Then to figure out if 3.002 is bigger than 3.001 you can just look and see that 2 is greater than 1 and that they're in the same places.

Thus from greatest to least it goes 3.02, 3.002, 3.001