Do the math Meaning in English
expression
Definition
To calculate or figure something out, especially when the answer is obvious or can be found easily by thinking.
Usage & Nuances
Informal; often used to point out that the answer is simple or obvious. It can suggest someone should think more carefully. Commonly used in conversations, sometimes with a sarcastic tone. Not about literal math—it can refer to adding up clues or facts.
Example Sentences
There are six chairs and seven people. You do the math.
basic
If you earn $10 and spend $8, you can do the math to see how much is left.
basic
It's cheaper to buy in bulk—you just have to do the math.
basic
You want to work less and earn more? Do the math.
natural
Trust me, once you do the math, it makes sense to go by train.
natural
He hasn't called or texted in weeks—do the math.
natural