Add 8/18 and 15/21
8/18 + 15/21 is 73/63.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 21 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 18 × 7 = 126,
8/18 = 8 × 7/18 × 7 = 56/126 - Likewise, for the 2nd fraction, since 21 × 6 = 126,
15/21 = 15 × 6/21 × 6 = 90/126 - Add the two like fractions:
56/126 + 90/126 = 56 + 90/126 = 146/126 - 146/126 simplified gives 73/63
- So, 8/18 + 15/21 = 73/63
In mixed form: 110/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/18+15/21 8/18+30/21 8/36+15/21 8/18+15/42 24/18+15/21 8/18+45/21 8/54+15/21 8/18+15/63 40/18+15/21 8/18+75/21 8/90+15/21 56/18+15/21