(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.

(informal) Discrete mathematics.

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).

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

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

plural of math grenade

plural of math circle

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