Add 20/3 and 90/21
1st number: 6 2/3, 2nd number: 4 6/21
20/3 + 90/21 is 230/21.
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,
90/21 = 90 × 1/21 × 1 = 90/21 - Add the two like fractions:
140/21 + 90/21 = 140 + 90/21 = 230/21 - So, 20/3 + 90/21 = 230/21
In mixed form: 1020/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/3+90/21 20/6+90/21 20/3+90/42 60/3+90/21 20/9+90/21 20/3+90/63 20/15+90/21 20/21+90/21