Add 4/21 and 8/18
4/21 + 8/18 is 40/63.
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,
4/21 = 4 × 6/21 × 6 = 24/126 - Likewise, for the 2nd fraction, since 18 × 7 = 126,
8/18 = 8 × 7/18 × 7 = 56/126 - Add the two like fractions:
24/126 + 56/126 = 24 + 56/126 = 80/126 - 80/126 simplified gives 40/63
- So, 4/21 + 8/18 = 40/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/21+8/18 4/21+16/18 4/42+8/18 4/21+8/36 12/21+8/18 4/21+24/18 4/63+8/18 4/21+8/54 20/21+8/18 4/21+40/18 4/21+8/90 28/21+8/18 4/21+56/18