Subtract 4/56 from 12/21
12/21 - 4/56 is 1/2.
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,
12/21 = 12 × 8/21 × 8 = 96/168 - Likewise, for the 2nd fraction, since 56 × 3 = 168,
4/56 = 4 × 3/56 × 3 = 12/168 - Subtract the two like fractions:
96/168 - 12/168 = 96 - 12/168 = 84/168 - After reducing the fraction, the answer is 1/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/21-4/56 12/21-8/56 12/42-4/56 36/21-4/56 12/21-12/56 12/63-4/56 60/21-4/56 12/21-20/56 84/21-4/56 12/21-28/56