Add 2/21 and 4/7
2/21 + 4/7 is 2/3.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 7 is 21
Next, find the equivalent fraction of both fractional numbers with denominator 21 - For the 1st fraction, since 21 × 1 = 21,
2/21 = 2 × 1/21 × 1 = 2/21 - Likewise, for the 2nd fraction, since 7 × 3 = 21,
4/7 = 4 × 3/7 × 3 = 12/21 - Add the two like fractions:
2/21 + 12/21 = 2 + 12/21 = 14/21 - 14/21 simplified gives 2/3
- So, 2/21 + 4/7 = 2/3
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 4/21+4/7 2/21+8/7 2/42+4/7 2/21+4/14 6/21+4/7 2/21+12/7 2/63+4/7 2/21+4/21 10/21+4/7 2/21+20/7 2/21+4/35 14/21+4/7 2/21+28/7 2/21+4/49