Subtract 90/12 from 24/21
1st number: 1 3/21, 2nd number: 7 6/12
24/21 - 90/12 is -89/14.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 12 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 21 × 4 = 84,
24/21 = 24 × 4/21 × 4 = 96/84 - Likewise, for the 2nd fraction, since 12 × 7 = 84,
90/12 = 90 × 7/12 × 7 = 630/84 - Subtract the two like fractions:
96/84 - 630/84 = 96 - 630/84 = -534/84 - After reducing the fraction, the answer is -89/14
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 48/21-90/12 24/42-90/12 24/21-90/24 72/21-90/12 24/63-90/12 24/21-90/36 24/21-90/60 24/21-90/84