Add 10/28 and 20/81
10/28 + 20/81 is 685/1134.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 81 is 2268
Next, find the equivalent fraction of both fractional numbers with denominator 2268 - For the 1st fraction, since 28 × 81 = 2268,
10/28 = 10 × 81/28 × 81 = 810/2268 - Likewise, for the 2nd fraction, since 81 × 28 = 2268,
20/81 = 20 × 28/81 × 28 = 560/2268 - Add the two like fractions:
810/2268 + 560/2268 = 810 + 560/2268 = 1370/2268 - 1370/2268 simplified gives 685/1134
- So, 10/28 + 20/81 = 685/1134
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/28+20/81 10/28+40/81 10/56+20/81 30/28+20/81 10/28+60/81 10/84+20/81 50/28+20/81 70/28+20/81