Subtract 21/49 from 25/72
25/72 - 21/49 is -41/504.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 72 and 49 is 3528
Next, find the equivalent fraction of both fractional numbers with denominator 3528 - For the 1st fraction, since 72 × 49 = 3528,
25/72 = 25 × 49/72 × 49 = 1225/3528 - Likewise, for the 2nd fraction, since 49 × 72 = 3528,
21/49 = 21 × 72/49 × 72 = 1512/3528 - Subtract the two like fractions:
1225/3528 - 1512/3528 = 1225 - 1512/3528 = -287/3528 - After reducing the fraction, the answer is -41/504
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 50/72-21/49 25/72-42/49 25/72-21/98 75/72-21/49 25/72-63/49