Subtract 21/70 from 49/5, Solve 9 4/5

Subtract 21/70 from 49/5

1^st number: 9 4/5, 2^nd number: 21/70

49/5 - 21/70 is 19/2.

Find the least common denominator or LCM of the two denominators:
LCM of 5 and 70 is 70

Next, find the equivalent fraction of both fractional numbers with denominator 70
For the 1st fraction, since 5 × 14 = 70,
49/5 = 49 × 14/5 × 14 = 686/70
Likewise, for the 2nd fraction, since 70 × 1 = 70,
21/70 = 21 × 1/70 × 1 = 21/70
Subtract the two like fractions:
686/70 - 21/70 = 686 - 21/70 = 665/70
After reducing the fraction, the answer is 19/2
In mixed form: 91/2

MathStep (Works offline)

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