Add 18/20 and 12/15
18/20 + 12/15 is 17/10.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 15 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 20 × 3 = 60,
18/20 = 18 × 3/20 × 3 = 54/60 - Likewise, for the 2nd fraction, since 15 × 4 = 60,
12/15 = 12 × 4/15 × 4 = 48/60 - Add the two like fractions:
54/60 + 48/60 = 54 + 48/60 = 102/60 - 102/60 simplified gives 17/10
- So, 18/20 + 12/15 = 17/10
In mixed form: 17/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/20+12/15 18/20+24/15 18/40+12/15 18/20+12/30 54/20+12/15 18/20+36/15 18/60+12/15 18/20+12/45 90/20+12/15 18/20+60/15 18/20+12/75 18/20+84/15