Subtract 54/56 from 16/21
16/21 - 54/56 is -17/84.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 56 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 21 × 8 = 168,
16/21 = 16 × 8/21 × 8 = 128/168 - Likewise, for the 2nd fraction, since 56 × 3 = 168,
54/56 = 54 × 3/56 × 3 = 162/168 - Subtract the two like fractions:
128/168 - 162/168 = 128 - 162/168 = -34/168 - After reducing the fraction, the answer is -17/84
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 32/21-54/56 16/42-54/56 48/21-54/56 16/63-54/56 80/21-54/56