Subtract 21/63 from 12/49
12/49 - 21/63 is -13/147.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 49 and 63 is 441
Next, find the equivalent fraction of both fractional numbers with denominator 441 - For the 1st fraction, since 49 × 9 = 441,
12/49 = 12 × 9/49 × 9 = 108/441 - Likewise, for the 2nd fraction, since 63 × 7 = 441,
21/63 = 21 × 7/63 × 7 = 147/441 - Subtract the two like fractions:
108/441 - 147/441 = 108 - 147/441 = -39/441 - After reducing the fraction, the answer is -13/147
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/49-21/63 12/49-42/63 12/98-21/63 36/49-21/63 60/49-21/63 84/49-21/63