New-math meaning

Mathematics taught in elementary and secondary schools that constructs mathematical relationships from set theory.
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A system for teaching fundamental concepts of mathematics by the use of set theory.
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(pejorative) The methodology used to arrive at an unreasonably incorrect answer for a mathematical calculation.

She quickly calculated the tip to be $45.00 on the restaurant tab of $110.50, apparently using new math.

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Origin of new-math

  • From the dramatic change in teaching practices for mathematics in the 1960s in America.

    From Wiktionary