Add 40/84 and 15/18
40/84 + 15/18 is 55/42.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 18 is 252
Next, find the equivalent fraction of both fractional numbers with denominator 252 - For the 1st fraction, since 84 × 3 = 252,
40/84 = 40 × 3/84 × 3 = 120/252 - Likewise, for the 2nd fraction, since 18 × 14 = 252,
15/18 = 15 × 14/18 × 14 = 210/252 - Add the two like fractions:
120/252 + 210/252 = 120 + 210/252 = 330/252 - 330/252 simplified gives 55/42
- So, 40/84 + 15/18 = 55/42
In mixed form: 113/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/84+15/18 40/84+30/18 40/84+15/36 40/84+45/18 40/84+15/54 40/84+75/18 40/84+15/90