Subtract 1/28 from 15/21
15/21 - 1/28 is 19/28.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 28 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 21 × 4 = 84,
15/21 = 15 × 4/21 × 4 = 60/84 - Likewise, for the 2nd fraction, since 28 × 3 = 84,
1/28 = 1 × 3/28 × 3 = 3/84 - Subtract the two like fractions:
60/84 - 3/84 = 60 - 3/84 = 57/84 - 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
Related: 30/21-1/28 15/21-2/28 15/42-1/28 15/21-1/56 45/21-1/28 15/21-3/28 15/63-1/28 15/21-1/84 75/21-1/28 15/21-5/28 15/21-7/28