Subtract 75/90 from 24/21
1st number: 1 3/21, 2nd number: 75/90
24/21 - 75/90 is 13/42.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 90 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 21 × 30 = 630,
24/21 = 24 × 30/21 × 30 = 720/630 - Likewise, for the 2nd fraction, since 90 × 7 = 630,
75/90 = 75 × 7/90 × 7 = 525/630 - Subtract the two like fractions:
720/630 - 525/630 = 720 - 525/630 = 195/630 - After reducing the fraction, the answer is 13/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 48/21-75/90 24/42-75/90 72/21-75/90 24/63-75/90