Subtract 30/28 from 16/21
1st number: 16/21, 2nd number: 1 2/28
16/21 - 30/28 is -13/42.
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,
16/21 = 16 × 4/21 × 4 = 64/84 - Likewise, for the 2nd fraction, since 28 × 3 = 84,
30/28 = 30 × 3/28 × 3 = 90/84 - Subtract the two like fractions:
64/84 - 90/84 = 64 - 90/84 = -26/84 - After reducing the fraction, the answer is -13/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 32/21-30/28 16/21-60/28 16/42-30/28 16/21-30/56 48/21-30/28 16/21-90/28 16/63-30/28 16/21-30/84 80/21-30/28