A tire impression left in the mud at a crime scene was 8.7 inches wide. How many centimeters is that?
The answer is
Use the multiply by 1 method to ensure you have the correct ratio:
#8.7 Inch *(2.54 cm)/(1 Inch)=22.098# #cm#
We have the inches cancelling out and
This is multiplying by 1 because we are multiplying by 2 things that are equal, that is,