Add 40/42 and 15/9
1st number: 40/42, 2nd number: 1 6/9
40/42 + 15/9 is 55/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 9 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 42 × 3 = 126,
40/42 = 40 × 3/42 × 3 = 120/126 - Likewise, for the 2nd fraction, since 9 × 14 = 126,
15/9 = 15 × 14/9 × 14 = 210/126 - Add the two like fractions:
120/126 + 210/126 = 120 + 210/126 = 330/126 - 330/126 simplified gives 55/21
- So, 40/42 + 15/9 = 55/21
In mixed form: 213/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/42+15/9 40/42+30/9 40/84+15/9 40/42+15/18 40/42+45/9 40/42+15/27 40/42+75/9 40/42+15/45 40/42+15/63