Add 45/12 and 20/18
1st number: 3 9/12, 2nd number: 1 2/18
45/12 + 20/18 is 175/36.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 18 is 36
Next, find the equivalent fraction of both fractional numbers with denominator 36 - For the 1st fraction, since 12 × 3 = 36,
45/12 = 45 × 3/12 × 3 = 135/36 - Likewise, for the 2nd fraction, since 18 × 2 = 36,
20/18 = 20 × 2/18 × 2 = 40/36 - Add the two like fractions:
135/36 + 40/36 = 135 + 40/36 = 175/36 - So, 45/12 + 20/18 = 175/36
In mixed form: 431/36
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/12+20/18 45/12+40/18 45/24+20/18 45/12+20/36 45/12+60/18 45/36+20/18 45/12+20/54 45/60+20/18 45/12+20/90 45/84+20/18