Subtract 90/8 from 14/21
1st number: 14/21, 2nd number: 11 2/8
14/21 - 90/8 is -127/12.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 8 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 21 × 8 = 168,
14/21 = 14 × 8/21 × 8 = 112/168 - Likewise, for the 2nd fraction, since 8 × 21 = 168,
90/8 = 90 × 21/8 × 21 = 1890/168 - Subtract the two like fractions:
112/168 - 1890/168 = 112 - 1890/168 = -1778/168 - After reducing the fraction, the answer is -127/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 28/21-90/8 14/42-90/8 14/21-90/16 42/21-90/8 14/63-90/8 14/21-90/24 70/21-90/8 14/21-90/40 98/21-90/8 14/21-90/56