Add 54/18 and 40/42
1st number: 3 0/18, 2nd number: 40/42
54/18 + 40/42 is 83/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 42 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 18 × 7 = 126,
54/18 = 54 × 7/18 × 7 = 378/126 - Likewise, for the 2nd fraction, since 42 × 3 = 126,
40/42 = 40 × 3/42 × 3 = 120/126 - Add the two like fractions:
378/126 + 120/126 = 378 + 120/126 = 498/126 - 498/126 simplified gives 83/21
- So, 54/18 + 40/42 = 83/21
In mixed form: 320/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/18+80/42 54/36+40/42 54/18+40/84 54/90+40/42