[ kraws-muhl-ti-plahy, kros- ]
/ ˈkrɔsˈmʌl tɪˌplaɪ, ˈkrɒs- /

verb (used without object), cross-mul·ti·plied, cross-mul·ti·ply·ing. Mathematics.

to remove fractions from an equation by multiplying each side by the common multiple of the denominators of the fractions of both sides.
Also cross multiply.

Origin of cross-multiply

First recorded in 1950–55
Related formscross-mul·ti·pli·ca·tion [kraws-muhl-ti-pli-key-shuh n, kros-] /ˈkrɔsˌmʌl tɪ plɪˌkeɪ ʃən, ˈkrɒs-/, cross multiplication, noun Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Science definitions for cross-multiply


To multiply the numerator of one of a pair of fractions by the denominator of the other.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.