Subtract 70/63 from 81/60, Solve 1 21/60

Subtract 70/63 from 81/60

1^st number: 1 21/60, 2^nd number: 1 7/63

81/60 - 70/63 is 43/180.

Find the least common denominator or LCM of the two denominators:
LCM of 60 and 63 is 1260

Next, find the equivalent fraction of both fractional numbers with denominator 1260
For the 1st fraction, since 60 × 21 = 1260,
81/60 = 81 × 21/60 × 21 = 1701/1260
Likewise, for the 2nd fraction, since 63 × 20 = 1260,
70/63 = 70 × 20/63 × 20 = 1400/1260
Subtract the two like fractions:
1701/1260 - 1400/1260 = 1701 - 1400/1260 = 301/1260
After reducing the fraction, the answer is 43/180

MathStep (Works offline)

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