Subtract 90/63 from 6/81
1st number: 6/81, 2nd number: 1 27/63
6/81 - 90/63 is -256/189.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 63 is 567
Next, find the equivalent fraction of both fractional numbers with denominator 567 - For the 1st fraction, since 81 × 7 = 567,
6/81 = 6 × 7/81 × 7 = 42/567 - Likewise, for the 2nd fraction, since 63 × 9 = 567,
90/63 = 90 × 9/63 × 9 = 810/567 - Subtract the two like fractions:
42/567 - 810/567 = 42 - 810/567 = -768/567 - After reducing the fraction, the answer is -256/189
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 12/81-90/63 18/81-90/63 30/81-90/63 42/81-90/63