Subtract 42/81 from 6/63
6/63 - 42/81 is -80/189.
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,
6/63 = 6 × 9/63 × 9 = 54/567 - Likewise, for the 2nd fraction, since 81 × 7 = 567,
42/81 = 42 × 7/81 × 7 = 294/567 - Subtract the two like fractions:
54/567 - 294/567 = 54 - 294/567 = -240/567 - After reducing the fraction, the answer is -80/189
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 12/63-42/81 6/63-84/81 18/63-42/81 30/63-42/81 42/63-42/81