Add 45/12 and 84/4
1st number: 3 9/12, 2nd number: 21 0/4
45/12 + 84/4 is 99/4.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 4 is 12
Next, find the equivalent fraction of both fractional numbers with denominator 12 - For the 1st fraction, since 12 × 1 = 12,
45/12 = 45 × 1/12 × 1 = 45/12 - Likewise, for the 2nd fraction, since 4 × 3 = 12,
84/4 = 84 × 3/4 × 3 = 252/12 - Add the two like fractions:
45/12 + 252/12 = 45 + 252/12 = 297/12 - 297/12 simplified gives 99/4
- So, 45/12 + 84/4 = 99/4
In mixed form: 243/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/12+84/4 45/24+84/4 45/12+84/8 45/36+84/4 45/12+84/12 45/60+84/4 45/12+84/20 45/84+84/4 45/12+84/28