Add 12/21 and 45/12
1st number: 12/21, 2nd number: 3 9/12
12/21 + 45/12 is 121/28.
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,
12/21 = 12 × 4/21 × 4 = 48/84 - Likewise, for the 2nd fraction, since 12 × 7 = 84,
45/12 = 45 × 7/12 × 7 = 315/84 - Add the two like fractions:
48/84 + 315/84 = 48 + 315/84 = 363/84 - 363/84 simplified gives 121/28
- So, 12/21 + 45/12 = 121/28
In mixed form: 49/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/21+45/12 12/21+90/12 12/42+45/12 12/21+45/24 36/21+45/12 12/63+45/12 12/21+45/36 60/21+45/12 12/21+45/60 84/21+45/12 12/21+45/84