Add 90/28 and 81/84
1st number: 3 6/28, 2nd number: 81/84
90/28 + 81/84 is 117/28.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 84 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 28 × 3 = 84,
90/28 = 90 × 3/28 × 3 = 270/84 - Likewise, for the 2nd fraction, since 84 × 1 = 84,
81/84 = 81 × 1/84 × 1 = 81/84 - Add the two like fractions:
270/84 + 81/84 = 270 + 81/84 = 351/84 - 351/84 simplified gives 117/28
- So, 90/28 + 81/84 = 117/28
In mixed form: 45/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/56+81/84 90/84+81/84