Subtract 27/21 from 15/10, Solve 1 5/10

Subtract 27/21 from 15/10

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

15/10 - 27/21 is 3/14.

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

Next, find the equivalent fraction of both fractional numbers with denominator 210
For the 1st fraction, since 10 × 21 = 210,
15/10 = 15 × 21/10 × 21 = 315/210
Likewise, for the 2nd fraction, since 21 × 10 = 210,
27/21 = 27 × 10/21 × 10 = 270/210
Subtract the two like fractions:
315/210 - 270/210 = 315 - 270/210 = 45/210
After reducing the fraction, the answer is 3/14

MathStep (Works offline)

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