Subtract 30/28 from 4/21
1st number: 4/21, 2nd number: 1 2/28
4/21 - 30/28 is -37/42.
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,
4/21 = 4 × 4/21 × 4 = 16/84 - Likewise, for the 2nd fraction, since 28 × 3 = 84,
30/28 = 30 × 3/28 × 3 = 90/84 - Subtract the two like fractions:
16/84 - 90/84 = 16 - 90/84 = -74/84 - After reducing the fraction, the answer is -37/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/21-30/28 4/21-60/28 4/42-30/28 4/21-30/56 12/21-30/28 4/21-90/28 4/63-30/28 4/21-30/84 20/21-30/28 28/21-30/28