Add 12/21 and 4/18
12/21 + 4/18 is 50/63.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 18 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 21 × 6 = 126,
12/21 = 12 × 6/21 × 6 = 72/126 - Likewise, for the 2nd fraction, since 18 × 7 = 126,
4/18 = 4 × 7/18 × 7 = 28/126 - Add the two like fractions:
72/126 + 28/126 = 72 + 28/126 = 100/126 - 100/126 simplified gives 50/63
- So, 12/21 + 4/18 = 50/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/21+4/18 12/21+8/18 12/42+4/18 12/21+4/36 36/21+4/18 12/21+12/18 12/63+4/18 12/21+4/54 60/21+4/18 12/21+20/18 12/21+4/90 84/21+4/18 12/21+28/18