It's 1/100 since 1 m = 100 cm.
1/100 is the inverse of the conversion factor.
For example, if you had to convert 50 m to cm, you would multiply 50 by 100 (1 m = 100 cm).
But to convert 50 cm to m, you would have to divide 50 by 100. So, 1 cm to m is 1/100.
