A shared multiple of the denominators of several fractions.
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it means when two denominators can reduce fast
When you're adding or subtracting fractions with different denominators, if you multiply the denominators that's your Quick Common Denominator. I'ts useful for denominators that don't have a low Least Common Factor.
Convert to its decimal equivalent (by dividing denominator into numerator).
Change the fractions to the same denominator then compare.A quick way is to multiply UP on cross multiply and compare.
Three is the greatest common factor of 33 and 87.