Add 30/28 and 81/84
1st number: 1 2/28, 2nd number: 81/84
30/28 + 81/84 is 57/28.
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,
30/28 = 30 × 3/28 × 3 = 90/84 - Likewise, for the 2nd fraction, since 84 × 1 = 84,
81/84 = 81 × 1/84 × 1 = 81/84 - Add the two like fractions:
90/84 + 81/84 = 90 + 81/84 = 171/84 - 171/84 simplified gives 57/28
- So, 30/28 + 81/84 = 57/28
In mixed form: 21/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/28+81/84 30/56+81/84 90/28+81/84 30/84+81/84