Subtract 4/30 from 28/21
1st number: 1 7/21, 2nd number: 4/30
28/21 - 4/30 is 6/5.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 30 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 21 × 10 = 210,
28/21 = 28 × 10/21 × 10 = 280/210 - Likewise, for the 2nd fraction, since 30 × 7 = 210,
4/30 = 4 × 7/30 × 7 = 28/210 - Subtract the two like fractions:
280/210 - 28/210 = 280 - 28/210 = 252/210 - After reducing the fraction, the answer is 6/5
- In mixed form: 11/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/21-4/30 28/21-8/30 28/42-4/30 28/21-4/60 84/21-4/30 28/21-12/30 28/63-4/30 28/21-4/90 28/21-20/30 28/21-28/30