Add 7/18 and 3/21
7/18 + 3/21 is 67/126.
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,
7/18 = 7 × 7/18 × 7 = 49/126 - Likewise, for the 2nd fraction, since 21 × 6 = 126,
3/21 = 3 × 6/21 × 6 = 18/126 - Add the two like fractions:
49/126 + 18/126 = 49 + 18/126 = 67/126 - So, 7/18 + 3/21 = 67/126
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/18+3/21 7/18+6/21 7/36+3/21 7/18+3/42 21/18+3/21 7/18+9/21 7/54+3/21 7/18+3/63 35/18+3/21 7/18+15/21 7/90+3/21 49/18+3/21