Add 3/18 and 6/21
3/18 + 6/21 is 19/42.
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,
3/18 = 3 × 7/18 × 7 = 21/126 - Likewise, for the 2nd fraction, since 21 × 6 = 126,
6/21 = 6 × 6/21 × 6 = 36/126 - Add the two like fractions:
21/126 + 36/126 = 21 + 36/126 = 57/126 - 57/126 simplified gives 19/42
- So, 3/18 + 6/21 = 19/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/18+6/21 3/18+12/21 3/36+6/21 3/18+6/42 9/18+6/21 3/18+18/21 3/54+6/21 3/18+6/63 15/18+6/21 3/18+30/21 3/90+6/21 21/18+6/21 3/18+42/21