Subtract 90/30 from 24/21
1st number: 1 3/21, 2nd number: 3 0/30
24/21 - 90/30 is -13/7.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 30 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 21 × 10 = 210,
24/21 = 24 × 10/21 × 10 = 240/210 - Likewise, for the 2nd fraction, since 30 × 7 = 210,
90/30 = 90 × 7/30 × 7 = 630/210 - Subtract the two like fractions:
240/210 - 630/210 = 240 - 630/210 = -390/210 - After reducing the fraction, the answer is -13/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 48/21-90/30 24/42-90/30 24/21-90/60 72/21-90/30 24/63-90/30