do the math
US /duː ðə mæθ/
UK /duː ðə mæθ/

1.
算一下, 計算一下
to calculate or consider the facts and figures to understand the implications or outcome of a situation
:
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If you work 60 hours a week at that pay, do the math – you're barely making minimum wage.
如果你每週工作60小時,工資是那樣,算一下——你幾乎沒掙到最低工資。
•
She said she could afford it, but when I did the math, it just didn't add up.
她說她能負擔得起,但當我算了一下,數字根本對不上。