do the math
idiomPart ofmath
do the math — idiom
1. To think carefully about the facts and figures in a situation in order to unders
1.idiom
Definition
To think carefully about the facts and figures in a situation in order to understand what will happen or what should be done.
Example
When Yara saw that the rent was more than half her pay, she did the math and knew she needed a roommate.
The mayor told voters to do the math on the two tax plans before making up their minds.