maths /mæθs/noun 3verb 2phrases 1 noun3 •(Canada) Arithmetic calculations; (see do the math).If you do the math, you'll see that it’s not such a bargain.$170 a month? That doesn’t sound right. Let me check your math. •(Canada) the subject that teaches how to count and work with numbers, and how to find sizes and shapesClarke stumbled into music by way of a high school course he took to raise his grades. "Music was a bird course. I had more interest in math, science, and women", he divulged. — 2002 •(informal) A math course or class.They needed to take two more maths in order to graduate.Did you take math today? / What did you do in math today? verb2 •(informal) To perform mathematical calculations or mathematical analysis; to do math •(slang) To add up, compute; (by extension) to make sense.Wait. This doesn't make sense. I mean, the math is not mathing. Phrases with maths do the mathsTo perform a mathematical calculation.