Add 45/4 and 20/12
1st number: 11 1/4, 2nd number: 1 8/12
45/4 + 20/12 is 155/12.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 12 is 12
Next, find the equivalent fraction of both fractional numbers with denominator 12 - For the 1st fraction, since 4 × 3 = 12,
45/4 = 45 × 3/4 × 3 = 135/12 - Likewise, for the 2nd fraction, since 12 × 1 = 12,
20/12 = 20 × 1/12 × 1 = 20/12 - Add the two like fractions:
135/12 + 20/12 = 135 + 20/12 = 155/12 - So, 45/4 + 20/12 = 155/12
In mixed form: 1211/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/4+20/12 45/4+40/12 45/8+20/12 45/4+20/24 45/4+60/12 45/12+20/12 45/4+20/36 45/20+20/12 45/4+20/60 45/28+20/12 45/4+20/84