Add 7/21 and 3/10
7/21 + 3/10 is 19/30.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 10 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 21 × 10 = 210,
7/21 = 7 × 10/21 × 10 = 70/210 - Likewise, for the 2nd fraction, since 10 × 21 = 210,
3/10 = 3 × 21/10 × 21 = 63/210 - Add the two like fractions:
70/210 + 63/210 = 70 + 63/210 = 133/210 - 133/210 simplified gives 19/30
- So, 7/21 + 3/10 = 19/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/21+3/10 7/21+6/10 7/42+3/10 7/21+3/20 7/21+9/10 7/63+3/10 7/21+3/30 35/21+3/10 7/21+15/10 7/21+3/50 49/21+3/10 7/21+21/10 7/21+3/70