Add 5/21 and 7/30
5/21 + 7/30 is 33/70.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 30 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 21 × 10 = 210,
5/21 = 5 × 10/21 × 10 = 50/210 - Likewise, for the 2nd fraction, since 30 × 7 = 210,
7/30 = 7 × 7/30 × 7 = 49/210 - Add the two like fractions:
50/210 + 49/210 = 50 + 49/210 = 99/210 - 99/210 simplified gives 33/70
- So, 5/21 + 7/30 = 33/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/21+7/30 5/21+14/30 5/42+7/30 5/21+7/60 15/21+7/30 5/21+21/30 5/63+7/30 5/21+7/90 25/21+7/30 5/21+35/30 35/21+7/30 5/21+49/30