Add 4/21 and 81/84
4/21 + 81/84 is 97/84.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 84 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 21 × 4 = 84,
4/21 = 4 × 4/21 × 4 = 16/84 - Likewise, for the 2nd fraction, since 84 × 1 = 84,
81/84 = 81 × 1/84 × 1 = 81/84 - Add the two like fractions:
16/84 + 81/84 = 16 + 81/84 = 97/84 - So, 4/21 + 81/84 = 97/84
In mixed form: 113/84
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/21+81/84 4/42+81/84 12/21+81/84 4/63+81/84 20/21+81/84 28/21+81/84