Add 3/12 and 9/45
3/12 + 9/45 is 9/20.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 45 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 12 × 15 = 180,
3/12 = 3 × 15/12 × 15 = 45/180 - Likewise, for the 2nd fraction, since 45 × 4 = 180,
9/45 = 9 × 4/45 × 4 = 36/180 - Add the two like fractions:
45/180 + 36/180 = 45 + 36/180 = 81/180 - 81/180 simplified gives 9/20
- So, 3/12 + 9/45 = 9/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/12+9/45 3/12+18/45 3/24+9/45 3/12+9/90 9/12+9/45 3/12+27/45 3/36+9/45 15/12+9/45 3/60+9/45 21/12+9/45 3/12+63/45 3/84+9/45