Subtract 28/30 from 42/7
1st number: 6 0/7, 2nd number: 28/30
42/7 - 28/30 is 76/15.
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,
42/7 = 42 × 30/7 × 30 = 1260/210 - Likewise, for the 2nd fraction, since 30 × 7 = 210,
28/30 = 28 × 7/30 × 7 = 196/210 - Subtract the two like fractions:
1260/210 - 196/210 = 1260 - 196/210 = 1064/210 - After reducing the fraction, the answer is 76/15
- In mixed form: 51/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/7-28/30 42/7-56/30 42/14-28/30 42/7-28/60 42/7-84/30 42/21-28/30 42/7-28/90 42/35-28/30 42/49-28/30