Subtract 25/24 from 21/90
1st number: 21/90, 2nd number: 1 1/24
21/90 - 25/24 is -97/120.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 24 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 90 × 4 = 360,
21/90 = 21 × 4/90 × 4 = 84/360 - Likewise, for the 2nd fraction, since 24 × 15 = 360,
25/24 = 25 × 15/24 × 15 = 375/360 - Subtract the two like fractions:
84/360 - 375/360 = 84 - 375/360 = -291/360 - After reducing the fraction, the answer is -97/120
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/90-25/24 21/90-50/24 21/90-25/48 63/90-25/24 21/90-75/24 21/90-25/72