Add 42/12 and 40/9
1st number: 3 6/12, 2nd number: 4 4/9
42/12 + 40/9 is 143/18.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 9 is 36
Next, find the equivalent fraction of both fractional numbers with denominator 36 - For the 1st fraction, since 12 × 3 = 36,
42/12 = 42 × 3/12 × 3 = 126/36 - Likewise, for the 2nd fraction, since 9 × 4 = 36,
40/9 = 40 × 4/9 × 4 = 160/36 - Add the two like fractions:
126/36 + 160/36 = 126 + 160/36 = 286/36 - 286/36 simplified gives 143/18
- So, 42/12 + 40/9 = 143/18
In mixed form: 717/18
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/12+40/9 42/12+80/9 42/24+40/9 42/12+40/18 42/36+40/9 42/12+40/27 42/60+40/9 42/12+40/45 42/84+40/9 42/12+40/63