Subtract 21/27 from 8/84
8/84 - 21/27 is -43/63.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 27 is 756
Next, find the equivalent fraction of both fractional numbers with denominator 756 - For the 1st fraction, since 84 × 9 = 756,
8/84 = 8 × 9/84 × 9 = 72/756 - Likewise, for the 2nd fraction, since 27 × 28 = 756,
21/27 = 21 × 28/27 × 28 = 588/756 - Subtract the two like fractions:
72/756 - 588/756 = 72 - 588/756 = -516/756 - After reducing the fraction, the answer is -43/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/84-21/27 8/84-42/27 8/84-21/54 24/84-21/27 8/84-63/27 8/84-21/81 40/84-21/27 56/84-21/27