Subtract 9/8 from 70/20, Solve 3 10/20

Subtract 9/8 from 70/20

1^st number: 3 10/20, 2^nd number: 1 1/8

70/20 - 9/8 is 19/8.

Find the least common denominator or LCM of the two denominators:
LCM of 20 and 8 is 40

Next, find the equivalent fraction of both fractional numbers with denominator 40
For the 1st fraction, since 20 × 2 = 40,
70/20 = 70 × 2/20 × 2 = 140/40
Likewise, for the 2nd fraction, since 8 × 5 = 40,
9/8 = 9 × 5/8 × 5 = 45/40
Subtract the two like fractions:
140/40 - 45/40 = 140 - 45/40 = 95/40
After reducing the fraction, the answer is 19/8
In mixed form: 23/8

MathStep (Works offline)

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