Add 90/84 and 40/81
1st number: 1 6/84, 2nd number: 40/81
90/84 + 40/81 is 1775/1134.
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,
90/84 = 90 × 27/84 × 27 = 2430/2268 - Likewise, for the 2nd fraction, since 81 × 28 = 2268,
40/81 = 40 × 28/81 × 28 = 1120/2268 - Add the two like fractions:
2430/2268 + 1120/2268 = 2430 + 1120/2268 = 3550/2268 - 3550/2268 simplified gives 1775/1134
- So, 90/84 + 40/81 = 1775/1134
In mixed form: 1641/1134
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/84+80/81