Add 70/84 and 20/81
70/84 + 20/81 is 175/162.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 81 is 2268
Next, find the equivalent fraction of both fractional numbers with denominator 2268 - For the 1st fraction, since 84 × 27 = 2268,
70/84 = 70 × 27/84 × 27 = 1890/2268 - Likewise, for the 2nd fraction, since 81 × 28 = 2268,
20/81 = 20 × 28/81 × 28 = 560/2268 - Add the two like fractions:
1890/2268 + 560/2268 = 1890 + 560/2268 = 2450/2268 - 2450/2268 simplified gives 175/162
- So, 70/84 + 20/81 = 175/162
In mixed form: 113/162
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/84+40/81 70/84+60/81