(US, education, historical) A dramatic and short-lived change in the teaching of mathematics in grade schools in the 1960s, focusing on abstract topics such as symbolic logic, to the detriment of simple arithmetic etc.

(chiefly US) To perform a mathematical calculation.

A rhythmically complex, often guitar-based style of experimental rock music that emerged in the late 1990s.

Alternative form of new math

(Canada, US) The act of performing quick mathematics often as a means of estimation, as if done on the back of a napkin (or in one's head).

(education) An informal space where people study and discuss mathematics, often involving games, hands-on activities, or competition.

plural of math circle

in education, a derogatory term for reform mathematics / a catch phrase used by American politicians to describe numbers that they claim do not add up correctly

plural of math grenade

(historical, slang) The Curta, a cylindrical hand-held mechanical calculator invented in the 1930s.