Subtract 21/56 from 4/84
4/84 - 21/56 is -55/168.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 56 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 84 × 2 = 168,
4/84 = 4 × 2/84 × 2 = 8/168 - Likewise, for the 2nd fraction, since 56 × 3 = 168,
21/56 = 21 × 3/56 × 3 = 63/168 - Subtract the two like fractions:
8/168 - 63/168 = 8 - 63/168 = -55/168
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/84-21/56 4/84-42/56 12/84-21/56 4/84-63/56 20/84-21/56 28/84-21/56