Add 7/21 and 10/30
7/21 + 10/30 is 2/3.
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,
7/21 = 7 × 10/21 × 10 = 70/210 - Likewise, for the 2nd fraction, since 30 × 7 = 210,
10/30 = 10 × 7/30 × 7 = 70/210 - Add the two like fractions:
70/210 + 70/210 = 70 + 70/210 = 140/210 - 140/210 simplified gives 2/3
- So, 7/21 + 10/30 = 2/3
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/21+10/30 7/21+20/30 7/42+10/30 7/21+10/60 7/63+10/30 7/21+10/90 35/21+10/30 7/21+50/30 49/21+10/30 7/21+70/30