Add 12/90 and 12/20
12/90 + 12/20 is 11/15.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 20 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 90 × 2 = 180,
12/90 = 12 × 2/90 × 2 = 24/180 - Likewise, for the 2nd fraction, since 20 × 9 = 180,
12/20 = 12 × 9/20 × 9 = 108/180 - Add the two like fractions:
24/180 + 108/180 = 24 + 108/180 = 132/180 - 132/180 simplified gives 11/15
- So, 12/90 + 12/20 = 11/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/90+12/20 12/90+24/20 12/90+12/40 36/90+12/20 12/90+36/20 12/90+12/60 60/90+12/20 12/90+60/20 84/90+12/20 12/90+84/20