Subtract 56/10 from 80/21, Solve 3 17/21

Subtract 56/10 from 80/21

1^st number: 3 17/21, 2^nd number: 5 6/10

80/21 - 56/10 is -188/105.

Find the least common denominator or LCM of the two denominators:
LCM of 21 and 10 is 210

Next, find the equivalent fraction of both fractional numbers with denominator 210
For the 1st fraction, since 21 × 10 = 210,
80/21 = 80 × 10/21 × 10 = 800/210
Likewise, for the 2nd fraction, since 10 × 21 = 210,
56/10 = 56 × 21/10 × 21 = 1176/210
Subtract the two like fractions:
800/210 - 1176/210 = 800 - 1176/210 = -376/210
After reducing the fraction, the answer is -188/105

MathStep (Works offline)

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