Add 45/21 and 21/12
1st number: 2 3/21, 2nd number: 1 9/12
45/21 + 21/12 is 109/28.
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,
21/12 = 21 × 7/12 × 7 = 147/84 - Add the two like fractions:
180/84 + 147/84 = 180 + 147/84 = 327/84 - 327/84 simplified gives 109/28
- So, 45/21 + 21/12 = 109/28
In mixed form: 325/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/21+21/12 45/21+42/12 45/42+21/12 45/21+21/24 45/21+63/12 45/63+21/12 45/21+21/36 45/21+21/60 45/21+21/84