Add 84/4 and 81/84
1st number: 21 0/4, 2nd number: 81/84
84/4 + 81/84 is 615/28.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 84 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 4 × 21 = 84,
84/4 = 84 × 21/4 × 21 = 1764/84 - Likewise, for the 2nd fraction, since 84 × 1 = 84,
81/84 = 81 × 1/84 × 1 = 81/84 - Add the two like fractions:
1764/84 + 81/84 = 1764 + 81/84 = 1845/84 - 1845/84 simplified gives 615/28
- So, 84/4 + 81/84 = 615/28
In mixed form: 2127/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/8+81/84 84/12+81/84 84/20+81/84 84/28+81/84