Subtract 12/56 from 90/21
1st number: 4 6/21, 2nd number: 12/56
90/21 - 12/56 is 57/14.
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,
90/21 = 90 × 8/21 × 8 = 720/168 - Likewise, for the 2nd fraction, since 56 × 3 = 168,
12/56 = 12 × 3/56 × 3 = 36/168 - Subtract the two like fractions:
720/168 - 36/168 = 720 - 36/168 = 684/168 - After reducing the fraction, the answer is 57/14
- In mixed form: 41/14
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/21-24/56 90/42-12/56 90/21-36/56 90/63-12/56 90/21-60/56 90/21-84/56