Add 20/3 and 90/7
1st number: 6 2/3, 2nd number: 12 6/7
20/3 + 90/7 is 410/21.
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,
90/7 = 90 × 3/7 × 3 = 270/21 - Add the two like fractions:
140/21 + 270/21 = 140 + 270/21 = 410/21 - So, 20/3 + 90/7 = 410/21
In mixed form: 1911/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/3+90/7 20/6+90/7 20/3+90/14 60/3+90/7 20/9+90/7 20/3+90/21 20/15+90/7 20/3+90/35 20/21+90/7 20/3+90/49