Subtract 42/7 from 28/15
1st number: 1 13/15, 2nd number: 6 0/7
28/15 - 42/7 is -62/15.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 7 is 105
Next, find the equivalent fraction of both fractional numbers with denominator 105 - For the 1st fraction, since 15 × 7 = 105,
28/15 = 28 × 7/15 × 7 = 196/105 - Likewise, for the 2nd fraction, since 7 × 15 = 105,
42/7 = 42 × 15/7 × 15 = 630/105 - Subtract the two like fractions:
196/105 - 630/105 = 196 - 630/105 = -434/105 - After reducing the fraction, the answer is -62/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/15-42/7 28/15-84/7 28/30-42/7 28/15-42/14 84/15-42/7 28/45-42/7 28/15-42/21 28/75-42/7 28/15-42/35 28/15-42/49