Subtract 63/81 from 4/7
4/7 - 63/81 is -13/63.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 81 is 567
Next, find the equivalent fraction of both fractional numbers with denominator 567 - For the 1st fraction, since 7 × 81 = 567,
4/7 = 4 × 81/7 × 81 = 324/567 - Likewise, for the 2nd fraction, since 81 × 7 = 567,
63/81 = 63 × 7/81 × 7 = 441/567 - Subtract the two like fractions:
324/567 - 441/567 = 324 - 441/567 = -117/567 - After reducing the fraction, the answer is -13/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/7-63/81 4/14-63/81 12/7-63/81 4/21-63/81 20/7-63/81 4/35-63/81 28/7-63/81 4/49-63/81