Add 12/20 and 30/90
12/20 + 30/90 is 14/15.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 90 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 20 × 9 = 180,
12/20 = 12 × 9/20 × 9 = 108/180 - Likewise, for the 2nd fraction, since 90 × 2 = 180,
30/90 = 30 × 2/90 × 2 = 60/180 - Add the two like fractions:
108/180 + 60/180 = 108 + 60/180 = 168/180 - 168/180 simplified gives 14/15
- So, 12/20 + 30/90 = 14/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/20+30/90 12/20+60/90 12/40+30/90 36/20+30/90 12/60+30/90 60/20+30/90 84/20+30/90