Subtract 21/30 from 28/7
1st number: 4 0/7, 2nd number: 21/30
28/7 - 21/30 is 33/10.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 30 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 7 × 30 = 210,
28/7 = 28 × 30/7 × 30 = 840/210 - Likewise, for the 2nd fraction, since 30 × 7 = 210,
21/30 = 21 × 7/30 × 7 = 147/210 - Subtract the two like fractions:
840/210 - 147/210 = 840 - 147/210 = 693/210 - After reducing the fraction, the answer is 33/10
- In mixed form: 33/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/7-21/30 28/7-42/30 28/14-21/30 28/7-21/60 84/7-21/30 28/7-63/30 28/21-21/30 28/7-21/90 28/35-21/30 28/49-21/30