Subtract 49/6 from 90/21
1st number: 4 6/21, 2nd number: 8 1/6
90/21 - 49/6 is -163/42.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 6 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 21 × 2 = 42,
90/21 = 90 × 2/21 × 2 = 180/42 - Likewise, for the 2nd fraction, since 6 × 7 = 42,
49/6 = 49 × 7/6 × 7 = 343/42 - Subtract the two like fractions:
180/42 - 343/42 = 180 - 343/42 = -163/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/21-98/6 90/42-49/6 90/21-49/12 90/63-49/6 90/21-49/18 90/21-49/30 90/21-49/42