Add 7/21 and 2/42
7/21 + 2/42 is 8/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 42 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 21 × 2 = 42,
7/21 = 7 × 2/21 × 2 = 14/42 - Likewise, for the 2nd fraction, since 42 × 1 = 42,
2/42 = 2 × 1/42 × 1 = 2/42 - Add the two like fractions:
14/42 + 2/42 = 14 + 2/42 = 16/42 - 16/42 simplified gives 8/21
- So, 7/21 + 2/42 = 8/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/21+2/42 7/21+4/42 7/42+2/42 7/21+2/84 7/21+6/42 7/63+2/42 35/21+2/42 7/21+10/42 49/21+2/42 7/21+14/42