Add 20/3 and 25/21
1st number: 6 2/3, 2nd number: 1 4/21
20/3 + 25/21 is 55/7.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 3 and 21 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 21 × 1 = 21,
25/21 = 25 × 1/21 × 1 = 25/21 - Add the two like fractions:
140/21 + 25/21 = 140 + 25/21 = 165/21 - 165/21 simplified gives 55/7
- So, 20/3 + 25/21 = 55/7
In mixed form: 76/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/3+25/21 20/3+50/21 20/6+25/21 20/3+25/42 60/3+25/21 20/3+75/21 20/9+25/21 20/3+25/63 20/15+25/21 20/21+25/21