Add 20/3 and 72/7
1st number: 6 2/3, 2nd number: 10 2/7
20/3 + 72/7 is 356/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 3 and 7 is 21
Next, find the equivalent fraction of both fractional numbers with denominator 21 - For the 1st fraction, since 3 × 7 = 21,
20/3 = 20 × 7/3 × 7 = 140/21 - Likewise, for the 2nd fraction, since 7 × 3 = 21,
72/7 = 72 × 3/7 × 3 = 216/21 - Add the two like fractions:
140/21 + 216/21 = 140 + 216/21 = 356/21 - So, 20/3 + 72/7 = 356/21
In mixed form: 1620/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/3+72/7 20/6+72/7 20/3+72/14 60/3+72/7 20/9+72/7 20/3+72/21 20/15+72/7 20/3+72/35 20/21+72/7 20/3+72/49