math

(you) do the math

Figure out or put together the information for yourself. Do the math—can't you see that he's just using you to get ahead in the company? What happened? They convinced you to give them a lump sum as an "investment," and now they've cleared out of town. You do the math.
See also: math

do the math

1. Literally, to do a bit of arithmetic calculation. Primarily heard in US, South Africa. Well, let's just do the math to see if you have enough in your savings account to afford a new car.
2. To figure out or put together information for oneself. Primarily heard in US, South Africa. Do the math—can't you see that he's just using you to get ahead in the company?
See also: math
Farlex Dictionary of Idioms.

you do the math

AMERICAN
People say you do the math to mean that the person they are talking to should calculate something because the answer will be interesting, important or surprising. In Canada, a country of more than 30 million people, a novel is considered to have sold respectably if three thousand copies leave the shelf. You do the math.
See also: math
Collins COBUILD Idioms Dictionary, 3rd ed.

do the math!

work it out for yourself (used to suggest that the conclusion to be drawn about something is obvious). North American informal
Math is the American abbreviation of mathematics . When the phrase is used in British English, it is usually as do the maths .
2004 BBC News: Business I was faced with the choice of either topping up by using paid holiday or a vast reduction in earnings and a financial struggle when I least need it. You do the maths!
Farlex Partner Idioms Dictionary
See also:
  • do the math
  • (you) do the math
  • live on (one's) own
  • live on own
  • face to face
  • face-to-face
  • be down with (something)
  • down with
  • down with something
  • F2F
References in periodicals archive
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Oh boy, Math. I think most people would say they are afraid of Math.
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In October, the board voted to let campuses use high school grade-point averages for math placement instead of the Accuplacer, and in December, they voted to suggest schools consider new math sequences tailored more narrowly to a student's major.
Washington, Aug 28 ( ANI ): Although girls report more math anxiety on general survey measures, they are not actually more anxious during math classes and exams, a new research has revealed.