Subtract 12/56 from 30/21
1st number: 1 9/21, 2nd number: 12/56
30/21 - 12/56 is 17/14.
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,
30/21 = 30 × 8/21 × 8 = 240/168 - Likewise, for the 2nd fraction, since 56 × 3 = 168,
12/56 = 12 × 3/56 × 3 = 36/168 - Subtract the two like fractions:
240/168 - 36/168 = 240 - 36/168 = 204/168 - After reducing the fraction, the answer is 17/14
- In mixed form: 13/14
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/21-12/56 30/21-24/56 30/42-12/56 90/21-12/56 30/21-36/56 30/63-12/56 30/21-60/56 30/21-84/56