Subtract 90/27 from 21/49
1st number: 21/49, 2nd number: 3 9/27
21/49 - 90/27 is -61/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 49 and 27 is 1323
Next, find the equivalent fraction of both fractional numbers with denominator 1323 - For the 1st fraction, since 49 × 27 = 1323,
21/49 = 21 × 27/49 × 27 = 567/1323 - Likewise, for the 2nd fraction, since 27 × 49 = 1323,
90/27 = 90 × 49/27 × 49 = 4410/1323 - Subtract the two like fractions:
567/1323 - 4410/1323 = 567 - 4410/1323 = -3843/1323 - After reducing the fraction, the answer is -61/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/49-90/27 21/98-90/27 21/49-90/54 63/49-90/27 21/49-90/81