Add 20/12 and 30/15
1st number: 1 8/12, 2nd number: 2 0/15
20/12 + 30/15 is 11/3.
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,
20/12 = 20 × 5/12 × 5 = 100/60 - Likewise, for the 2nd fraction, since 15 × 4 = 60,
30/15 = 30 × 4/15 × 4 = 120/60 - Add the two like fractions:
100/60 + 120/60 = 100 + 120/60 = 220/60 - 220/60 simplified gives 11/3
- So, 20/12 + 30/15 = 11/3
In mixed form: 32/3
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/12+30/15 20/12+60/15 20/24+30/15 60/12+30/15 20/12+90/15 20/36+30/15 20/12+30/45 20/60+30/15 20/12+30/75 20/84+30/15