Add 81/12 and 30/15
1st number: 6 9/12, 2nd number: 2 0/15
81/12 + 30/15 is 35/4.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 15 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 12 × 5 = 60,
81/12 = 81 × 5/12 × 5 = 405/60 - Likewise, for the 2nd fraction, since 15 × 4 = 60,
30/15 = 30 × 4/15 × 4 = 120/60 - Add the two like fractions:
405/60 + 120/60 = 405 + 120/60 = 525/60 - 525/60 simplified gives 35/4
- So, 81/12 + 30/15 = 35/4
In mixed form: 83/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/12+60/15 81/24+30/15 81/12+90/15 81/36+30/15 81/12+30/45 81/60+30/15 81/12+30/75 81/84+30/15