Add 45/12 and 2/21
1st number: 3 9/12, 2nd number: 2/21
45/12 + 2/21 is 323/84.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 21 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 12 × 7 = 84,
45/12 = 45 × 7/12 × 7 = 315/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
2/21 = 2 × 4/21 × 4 = 8/84 - Add the two like fractions:
315/84 + 8/84 = 315 + 8/84 = 323/84 - So, 45/12 + 2/21 = 323/84
In mixed form: 371/84
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/12+2/21 45/12+4/21 45/24+2/21 45/12+2/42 45/12+6/21 45/36+2/21 45/12+2/63 45/12+10/21 45/60+2/21 45/12+14/21 45/84+2/21