Add 15/18 and 70/42
1st number: 15/18, 2nd number: 1 28/42
15/18 + 70/42 is 5/2.
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,
15/18 = 15 × 7/18 × 7 = 105/126 - Likewise, for the 2nd fraction, since 42 × 3 = 126,
70/42 = 70 × 3/42 × 3 = 210/126 - Add the two like fractions:
105/126 + 210/126 = 105 + 210/126 = 315/126 - 315/126 simplified gives 5/2
- So, 15/18 + 70/42 = 5/2
In mixed form: 21/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/18+70/42 15/36+70/42 15/18+70/84 45/18+70/42 15/54+70/42 75/18+70/42 15/90+70/42