Subtract 90/6 from 7/21
1st number: 7/21, 2nd number: 15 0/6
7/21 - 90/6 is -44/3.
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,
7/21 = 7 × 2/21 × 2 = 14/42 - Likewise, for the 2nd fraction, since 6 × 7 = 42,
90/6 = 90 × 7/6 × 7 = 630/42 - Subtract the two like fractions:
14/42 - 630/42 = 14 - 630/42 = -616/42 - After reducing the fraction, the answer is -44/3
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/21-90/6 7/42-90/6 7/21-90/12 7/63-90/6 7/21-90/18 35/21-90/6 7/21-90/30 49/21-90/6 7/21-90/42