Subtract 5/7 from 28/42
28/42 - 5/7 is -1/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 7 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 42 × 1 = 42,
28/42 = 28 × 1/42 × 1 = 28/42 - Likewise, for the 2nd fraction, since 7 × 6 = 42,
5/7 = 5 × 6/7 × 6 = 30/42 - Subtract the two like fractions:
28/42 - 30/42 = 28 - 30/42 = -2/42 - After reducing the fraction, the answer is -1/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/42-5/7 28/42-10/7 28/84-5/7 28/42-5/14 84/42-5/7 28/42-15/7 28/42-5/21 28/42-25/7 28/42-5/35 28/42-35/7 28/42-5/49