Add 81/84 and 42/9
1st number: 81/84, 2nd number: 4 6/9
81/84 + 42/9 is 473/84.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 9 is 252
Next, find the equivalent fraction of both fractional numbers with denominator 252 - For the 1st fraction, since 84 × 3 = 252,
81/84 = 81 × 3/84 × 3 = 243/252 - Likewise, for the 2nd fraction, since 9 × 28 = 252,
42/9 = 42 × 28/9 × 28 = 1176/252 - Add the two like fractions:
243/252 + 1176/252 = 243 + 1176/252 = 1419/252 - 1419/252 simplified gives 473/84
- So, 81/84 + 42/9 = 473/84
In mixed form: 553/84
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/84+84/9 81/84+42/18 81/84+42/27 81/84+42/45 81/84+42/63