Subtract 25/49 from 8/21
8/21 - 25/49 is -19/147.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 49 is 147
Next, find the equivalent fraction of both fractional numbers with denominator 147 - For the 1st fraction, since 21 × 7 = 147,
8/21 = 8 × 7/21 × 7 = 56/147 - Likewise, for the 2nd fraction, since 49 × 3 = 147,
25/49 = 25 × 3/49 × 3 = 75/147 - Subtract the two like fractions:
56/147 - 75/147 = 56 - 75/147 = -19/147
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/21-25/49 8/21-50/49 8/42-25/49 8/21-25/98 24/21-25/49 8/21-75/49 8/63-25/49 40/21-25/49 56/21-25/49