Subtract 21/7 from 24/90
1st number: 24/90, 2nd number: 3 0/7
24/90 - 21/7 is -41/15.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 7 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 90 × 7 = 630,
24/90 = 24 × 7/90 × 7 = 168/630 - Likewise, for the 2nd fraction, since 7 × 90 = 630,
21/7 = 21 × 90/7 × 90 = 1890/630 - Subtract the two like fractions:
168/630 - 1890/630 = 168 - 1890/630 = -1722/630 - After reducing the fraction, the answer is -41/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 48/90-21/7 24/90-42/7 24/90-21/14 72/90-21/7 24/90-63/7 24/90-21/35 24/90-21/49