how do u add and subtract time....
ex.
Math class is dismissed at 2:20pm ,It is now 1:53pm how many more minutes before math class is dismissed.
It is a subtraction, but remember each hour is 60 min.
2:20
- 1:53
but you cant subtract 53 from 20, so you borrow..
1:80
-1:53
and the answer is 27 minutes.