Add 7/21 and 20/10
1st number: 7/21, 2nd number: 2 0/10
7/21 + 20/10 is 7/3.
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,
20/10 = 20 × 21/10 × 21 = 420/210 - Add the two like fractions:
70/210 + 420/210 = 70 + 420/210 = 490/210 - 490/210 simplified gives 7/3
- So, 7/21 + 20/10 = 7/3
In mixed form: 21/3
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/21+20/10 7/21+40/10 7/42+20/10 7/21+60/10 7/63+20/10 7/21+20/30 35/21+20/10 7/21+20/50 49/21+20/10 7/21+20/70