Add 45/21 and 3/12
1st number: 2 3/21, 2nd number: 3/12
45/21 + 3/12 is 67/28.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 12 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 21 × 4 = 84,
45/21 = 45 × 4/21 × 4 = 180/84 - Likewise, for the 2nd fraction, since 12 × 7 = 84,
3/12 = 3 × 7/12 × 7 = 21/84 - Add the two like fractions:
180/84 + 21/84 = 180 + 21/84 = 201/84 - 201/84 simplified gives 67/28
- So, 45/21 + 3/12 = 67/28
In mixed form: 211/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/21+3/12 45/21+6/12 45/42+3/12 45/21+3/24 45/21+9/12 45/63+3/12 45/21+3/36 45/21+15/12 45/21+3/60 45/21+21/12 45/21+3/84