Subtract 28/8 from 42/7
1st number: 6 0/7, 2nd number: 3 4/8
42/7 - 28/8 is 5/2.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 8 is 56
Next, find the equivalent fraction of both fractional numbers with denominator 56 - For the 1st fraction, since 7 × 8 = 56,
42/7 = 42 × 8/7 × 8 = 336/56 - Likewise, for the 2nd fraction, since 8 × 7 = 56,
28/8 = 28 × 7/8 × 7 = 196/56 - Subtract the two like fractions:
336/56 - 196/56 = 336 - 196/56 = 140/56 - After reducing the fraction, the answer is 5/2
- In mixed form: 21/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/7-28/8 42/7-56/8 42/14-28/8 42/7-28/16 42/7-84/8 42/21-28/8 42/7-28/24 42/35-28/8 42/7-28/40 42/49-28/8 42/7-28/56