Add 12/90 and 21/36
12/90 + 21/36 is 43/60.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 36 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 36 × 5 = 180,
21/36 = 21 × 5/36 × 5 = 105/180 - Add the two like fractions:
24/180 + 105/180 = 24 + 105/180 = 129/180 - 129/180 simplified gives 43/60
- So, 12/90 + 21/36 = 43/60
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/90+21/36 12/90+42/36 12/90+21/72 36/90+21/36 12/90+63/36 60/90+21/36 84/90+21/36