Subtract 5/7 from 28/84
28/84 - 5/7 is -8/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 7 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 84 × 1 = 84,
28/84 = 28 × 1/84 × 1 = 28/84 - Likewise, for the 2nd fraction, since 7 × 12 = 84,
5/7 = 5 × 12/7 × 12 = 60/84 - Subtract the two like fractions:
28/84 - 60/84 = 28 - 60/84 = -32/84 - After reducing the fraction, the answer is -8/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/84-5/7 28/84-10/7 28/84-5/14 28/84-15/7 28/84-5/21 28/84-25/7 28/84-5/35 28/84-35/7 28/84-5/49