Add 20/10 and 3/21
1st number: 2 0/10, 2nd number: 3/21
20/10 + 3/21 is 15/7.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 10 and 21 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 10 × 21 = 210,
20/10 = 20 × 21/10 × 21 = 420/210 - Likewise, for the 2nd fraction, since 21 × 10 = 210,
3/21 = 3 × 10/21 × 10 = 30/210 - Add the two like fractions:
420/210 + 30/210 = 420 + 30/210 = 450/210 - 450/210 simplified gives 15/7
- So, 20/10 + 3/21 = 15/7
In mixed form: 21/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/10+3/21 20/10+6/21 20/10+3/42 60/10+3/21 20/10+9/21 20/30+3/21 20/10+3/63 20/10+15/21 20/50+3/21 20/70+3/21