For this question, let's move the decimal number 2 spaces to the right. 2.16-->216
You need 21 ten rods and 6 cubes. Why: I wouldn't do 2 hundred flats because 2 isn't divisible by 3.
Put the ten rods into 3 equal group, then do the same with the cubes.
You should end up with 7 in each group since 21 divided by 3 is 7.
You should also end up with 2 cubes in each group.
So in one group you have 72. Now move the decimal back to where it came from, 2 spaces to the left. Now you have 0.72.
