Add 9/12 and 15/40
9/12 + 15/40 is 9/8.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 40 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 12 × 10 = 120,
9/12 = 9 × 10/12 × 10 = 90/120 - Likewise, for the 2nd fraction, since 40 × 3 = 120,
15/40 = 15 × 3/40 × 3 = 45/120 - Add the two like fractions:
90/120 + 45/120 = 90 + 45/120 = 135/120 - 135/120 simplified gives 9/8
- So, 9/12 + 15/40 = 9/8
In mixed form: 11/8
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/12+15/40 9/12+30/40 9/24+15/40 9/12+15/80 27/12+15/40 9/12+45/40 9/36+15/40 45/12+15/40 9/12+75/40 9/60+15/40 63/12+15/40 9/84+15/40