Add 90/3 and 12/21
1st number: 30 0/3, 2nd number: 12/21
90/3 + 12/21 is 214/7.
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,
90/3 = 90 × 7/3 × 7 = 630/21 - Likewise, for the 2nd fraction, since 21 × 1 = 21,
12/21 = 12 × 1/21 × 1 = 12/21 - Add the two like fractions:
630/21 + 12/21 = 630 + 12/21 = 642/21 - 642/21 simplified gives 214/7
- So, 90/3 + 12/21 = 214/7
In mixed form: 304/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/3+24/21 90/6+12/21 90/3+12/42 90/3+36/21 90/9+12/21 90/3+12/63 90/3+60/21 90/15+12/21 90/3+84/21 90/21+12/21