Subtract 70/84 from 10/81
10/81 - 70/84 is -115/162.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 84 is 2268
Next, find the equivalent fraction of both fractional numbers with denominator 2268 - For the 1st fraction, since 81 × 28 = 2268,
10/81 = 10 × 28/81 × 28 = 280/2268 - Likewise, for the 2nd fraction, since 84 × 27 = 2268,
70/84 = 70 × 27/84 × 27 = 1890/2268 - Subtract the two like fractions:
280/2268 - 1890/2268 = 280 - 1890/2268 = -1610/2268 - After reducing the fraction, the answer is -115/162
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/81-70/84 30/81-70/84 50/81-70/84 70/81-70/84