Subtract 5/21 from 30/56
30/56 - 5/21 is 25/84.
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,
30/56 = 30 × 3/56 × 3 = 90/168 - Likewise, for the 2nd fraction, since 21 × 8 = 168,
5/21 = 5 × 8/21 × 8 = 40/168 - Subtract the two like fractions:
90/168 - 40/168 = 90 - 40/168 = 50/168 - After reducing the fraction, the answer is 25/84
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/56-5/21 30/56-10/21 30/56-5/42 90/56-5/21 30/56-15/21 30/56-5/63 30/56-25/21 30/56-35/21