Add 42/84 and 15/81
42/84 + 15/81 is 37/54.
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,
42/84 = 42 × 27/84 × 27 = 1134/2268 - Likewise, for the 2nd fraction, since 81 × 28 = 2268,
15/81 = 15 × 28/81 × 28 = 420/2268 - Add the two like fractions:
1134/2268 + 420/2268 = 1134 + 420/2268 = 1554/2268 - 1554/2268 simplified gives 37/54
- So, 42/84 + 15/81 = 37/54
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/84+30/81 42/84+45/81 42/84+75/81