Subtract 15/21 from 54/56
54/56 - 15/21 is 1/4.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 56 and 21 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 56 × 3 = 168,
54/56 = 54 × 3/56 × 3 = 162/168 - Likewise, for the 2nd fraction, since 21 × 8 = 168,
15/21 = 15 × 8/21 × 8 = 120/168 - Subtract the two like fractions:
162/168 - 120/168 = 162 - 120/168 = 42/168 - After reducing the fraction, the answer is 1/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/56-30/21 54/56-15/42 54/56-45/21 54/56-15/63 54/56-75/21