Subtract 21/49 from 9/63
9/63 - 21/49 is -2/7.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 63 and 49 is 441
Next, find the equivalent fraction of both fractional numbers with denominator 441 - For the 1st fraction, since 63 × 7 = 441,
9/63 = 9 × 7/63 × 7 = 63/441 - Likewise, for the 2nd fraction, since 49 × 9 = 441,
21/49 = 21 × 9/49 × 9 = 189/441 - Subtract the two like fractions:
63/441 - 189/441 = 63 - 189/441 = -126/441 - After reducing the fraction, the answer is -2/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/63-21/49 9/63-42/49 9/63-21/98 27/63-21/49 9/63-63/49 45/63-21/49