Subtract 10/30 from 20/28
20/28 - 10/30 is 8/21.
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,
20/28 = 20 × 15/28 × 15 = 300/420 - Likewise, for the 2nd fraction, since 30 × 14 = 420,
10/30 = 10 × 14/30 × 14 = 140/420 - Subtract the two like fractions:
300/420 - 140/420 = 300 - 140/420 = 160/420 - After reducing the fraction, the answer is 8/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/28-10/30 20/28-20/30 20/56-10/30 20/28-10/60 60/28-10/30 20/84-10/30 20/28-10/90 20/28-50/30 20/28-70/30