Subtract 20/14 from 30/40, Solve 30/40

Subtract 20/14 from 30/40

1^st number: 30/40, 2^nd number: 1 6/14

30/40 - 20/14 is -19/28.

Find the least common denominator or LCM of the two denominators:
LCM of 40 and 14 is 280

Next, find the equivalent fraction of both fractional numbers with denominator 280
For the 1st fraction, since 40 × 7 = 280,
30/40 = 30 × 7/40 × 7 = 210/280
Likewise, for the 2nd fraction, since 14 × 20 = 280,
20/14 = 20 × 20/14 × 20 = 400/280
Subtract the two like fractions:
210/280 - 400/280 = 210 - 400/280 = -190/280
After reducing the fraction, the answer is -19/28

MathStep (Works offline)

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