Subtract 90/4 from 5/21
1st number: 5/21, 2nd number: 22 2/4
5/21 - 90/4 is -935/42.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 4 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 21 × 4 = 84,
5/21 = 5 × 4/21 × 4 = 20/84 - Likewise, for the 2nd fraction, since 4 × 21 = 84,
90/4 = 90 × 21/4 × 21 = 1890/84 - Subtract the two like fractions:
20/84 - 1890/84 = 20 - 1890/84 = -1870/84 - After reducing the fraction, the answer is -935/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/21-90/4 5/42-90/4 5/21-90/8 15/21-90/4 5/63-90/4 5/21-90/12 25/21-90/4 5/21-90/20 35/21-90/4 5/21-90/28