A large garage has 22 cars. If we remove 13 cars, how many cars will be left?
This is a subtraction problem because we want to know how many cars are left over after we have removed some cars. We start with the number of cars that we started with, and then we subtract the number of cars that have been removed.
The keywords to look out for in a problem involving subtraction are: take away; how many more; how many less; how many left; greater; smaller.