Add 8/21 and 45/12
1st number: 8/21, 2nd number: 3 9/12
8/21 + 45/12 is 347/84.
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,
8/21 = 8 × 4/21 × 4 = 32/84 - Likewise, for the 2nd fraction, since 12 × 7 = 84,
45/12 = 45 × 7/12 × 7 = 315/84 - Add the two like fractions:
32/84 + 315/84 = 32 + 315/84 = 347/84 - So, 8/21 + 45/12 = 347/84
In mixed form: 411/84
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/21+45/12 8/21+90/12 8/42+45/12 8/21+45/24 24/21+45/12 8/63+45/12 8/21+45/36 40/21+45/12 8/21+45/60 56/21+45/12 8/21+45/84