Subtract 20/30 from 6/28
6/28 - 20/30 is -19/42.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 30 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 28 × 15 = 420,
6/28 = 6 × 15/28 × 15 = 90/420 - Likewise, for the 2nd fraction, since 30 × 14 = 420,
20/30 = 20 × 14/30 × 14 = 280/420 - Subtract the two like fractions:
90/420 - 280/420 = 90 - 280/420 = -190/420 - After reducing the fraction, the answer is -19/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 12/28-20/30 6/28-40/30 6/56-20/30 6/28-20/60 18/28-20/30 6/28-60/30 6/84-20/30 6/28-20/90 30/28-20/30 42/28-20/30