The phrase "quick math" is commonly used to describe the ability to perform simple calculations or solve math problems quickly and easily. Full definition
Doing quick math shows that buying an affordable home for $ 100,000 would require making a $ 20,000 down payment, along with closing costs and other expected payments. (gobankingrates.com)
Well, do a bit of quick math and I think you'll find that this market can, in fact, prove quite lucrative. (awai.com)