Subtract 27/5 from 63/21, Solve 3 0/21

Subtract 27/5 from 63/21

1^st number: 3 0/21, 2^nd number: 5 2/5

63/21 - 27/5 is -12/5.

Find the least common denominator or LCM of the two denominators:
LCM of 21 and 5 is 105

Next, find the equivalent fraction of both fractional numbers with denominator 105
For the 1st fraction, since 21 × 5 = 105,
63/21 = 63 × 5/21 × 5 = 315/105
Likewise, for the 2nd fraction, since 5 × 21 = 105,
27/5 = 27 × 21/5 × 21 = 567/105
Subtract the two like fractions:
315/105 - 567/105 = 315 - 567/105 = -252/105
After reducing the fraction, the answer is -12/5

MathStep (Works offline)

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