Subtract 84/63 from 8/81
1st number: 8/81, 2nd number: 1 21/63
8/81 - 84/63 is -100/81.
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,
8/81 = 8 × 7/81 × 7 = 56/567 - Likewise, for the 2nd fraction, since 63 × 9 = 567,
84/63 = 84 × 9/63 × 9 = 756/567 - Subtract the two like fractions:
56/567 - 756/567 = 56 - 756/567 = -700/567 - After reducing the fraction, the answer is -100/81
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/81-84/63 24/81-84/63 40/81-84/63 56/81-84/63