Subtract 90/14 from 12/21
1st number: 12/21, 2nd number: 6 6/14
12/21 - 90/14 is -41/7.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 14 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 21 × 2 = 42,
12/21 = 12 × 2/21 × 2 = 24/42 - Likewise, for the 2nd fraction, since 14 × 3 = 42,
90/14 = 90 × 3/14 × 3 = 270/42 - Subtract the two like fractions:
24/42 - 270/42 = 24 - 270/42 = -246/42 - After reducing the fraction, the answer is -41/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/21-90/14 12/42-90/14 12/21-90/28 36/21-90/14 12/63-90/14 12/21-90/42 60/21-90/14 12/21-90/70 84/21-90/14 12/21-90/98