Last month john spent 75.00 dollars on games. this month he only spent 63.00. he spent percent less this month

First, subtract 63 from 75 to find out how much it decreased. 
75 - 63 = 12 
Divide 12 by 75. 
12 / 75 = 0.16
In percents, that is 16%. 
He spent 16% less this month. 
Hope this helps!