Subtract 27/42 from 9/80, Solve 9/80

Subtract 27/42 from 9/80

9/80 - 27/42 is -297/560.

Find the least common denominator or LCM of the two denominators:
LCM of 80 and 42 is 1680

Next, find the equivalent fraction of both fractional numbers with denominator 1680
For the 1st fraction, since 80 × 21 = 1680,
9/80 = 9 × 21/80 × 21 = 189/1680
Likewise, for the 2nd fraction, since 42 × 40 = 1680,
27/42 = 27 × 40/42 × 40 = 1080/1680
Subtract the two like fractions:
189/1680 - 1080/1680 = 189 - 1080/1680 = -891/1680
After reducing the fraction, the answer is -297/560

MathStep (Works offline)

Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad