Subtract 25/49 from 12/21
12/21 - 25/49 is 3/49.
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,
12/21 = 12 × 7/21 × 7 = 84/147 - Likewise, for the 2nd fraction, since 49 × 3 = 147,
25/49 = 25 × 3/49 × 3 = 75/147 - Subtract the two like fractions:
84/147 - 75/147 = 84 - 75/147 = 9/147 - After reducing the fraction, the answer is 3/49
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/21-25/49 12/21-50/49 12/42-25/49 12/21-25/98 36/21-25/49 12/21-75/49 12/63-25/49 60/21-25/49 84/21-25/49