This week in math I have learned how to convert different measurements in the Imperial System: Example: 0.04mm to meters.
using this scale, every line up you divide by 10 and every line down you multiply by 10.
So on the scale you go up 3 steps, from mm to meters, dividing by 10 each step. so in total. so you would divide 0.04 by 1000, which would equal 0.00004, or 4 x 10 to the -5