Subtract 30/7 from 24/20, Solve 1 4/20

Subtract 30/7 from 24/20

1^st number: 1 4/20, 2^nd number: 4 2/7

24/20 - 30/7 is -108/35.

Find the least common denominator or LCM of the two denominators:
LCM of 20 and 7 is 140

Next, find the equivalent fraction of both fractional numbers with denominator 140
For the 1st fraction, since 20 × 7 = 140,
24/20 = 24 × 7/20 × 7 = 168/140
Likewise, for the 2nd fraction, since 7 × 20 = 140,
30/7 = 30 × 20/7 × 20 = 600/140
Subtract the two like fractions:
168/140 - 600/140 = 168 - 600/140 = -432/140
After reducing the fraction, the answer is -108/35

MathStep (Works offline)

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