Subtract 21/28 from 15/20
15/20 - 21/28 is 0/1.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 28 is 140
Next, find the equivalent fraction of both fractional numbers with denominator 140 - For the 1st fraction, since 20 × 7 = 140,
15/20 = 15 × 7/20 × 7 = 105/140 - Likewise, for the 2nd fraction, since 28 × 5 = 140,
21/28 = 21 × 5/28 × 5 = 105/140 - Subtract the two like fractions:
105/140 - 105/140 = 105 - 105/140 = 0/140 - The answer is 0
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/20-21/28 15/20-42/28 15/40-21/28 15/20-21/56 45/20-21/28 15/20-63/28 15/60-21/28 15/20-21/84 75/20-21/28