Subtract 16/21 from 1/28
1/28 - 16/21 is -61/84.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 21 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 28 × 3 = 84,
1/28 = 1 × 3/28 × 3 = 3/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
16/21 = 16 × 4/21 × 4 = 64/84 - Subtract the two like fractions:
3/84 - 64/84 = 3 - 64/84 = -61/84
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/28-16/21 1/28-32/21 1/56-16/21 1/28-16/42 3/28-16/21 1/28-48/21 1/84-16/21 1/28-16/63 5/28-16/21 1/28-80/21 7/28-16/21