Subtract 49/81 from 18/63
18/63 - 49/81 is -181/567.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 63 and 81 is 567
Next, find the equivalent fraction of both fractional numbers with denominator 567 - For the 1st fraction, since 63 × 9 = 567,
18/63 = 18 × 9/63 × 9 = 162/567 - Likewise, for the 2nd fraction, since 81 × 7 = 567,
49/81 = 49 × 7/81 × 7 = 343/567 - Subtract the two like fractions:
162/567 - 343/567 = 162 - 343/567 = -181/567
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/63-49/81 18/63-98/81 54/63-49/81 90/63-49/81