Add 45/12 and 81/84
1st number: 3 9/12, 2nd number: 81/84
45/12 + 81/84 is 33/7.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 84 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 12 × 7 = 84,
45/12 = 45 × 7/12 × 7 = 315/84 - Likewise, for the 2nd fraction, since 84 × 1 = 84,
81/84 = 81 × 1/84 × 1 = 81/84 - Add the two like fractions:
315/84 + 81/84 = 315 + 81/84 = 396/84 - 396/84 simplified gives 33/7
- So, 45/12 + 81/84 = 33/7
In mixed form: 45/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/12+81/84 45/24+81/84 45/36+81/84 45/60+81/84 45/84+81/84