Add 81/12 and 45/15
1st number: 6 9/12, 2nd number: 3 0/15
81/12 + 45/15 is 39/4.
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,
45/15 = 45 × 4/15 × 4 = 180/60 - Add the two like fractions:
405/60 + 180/60 = 405 + 180/60 = 585/60 - 585/60 simplified gives 39/4
- So, 81/12 + 45/15 = 39/4
In mixed form: 93/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/12+90/15 81/24+45/15 81/12+45/30 81/36+45/15 81/60+45/15 81/12+45/75 81/84+45/15