Add 45/12 and 21/63
1st number: 3 9/12, 2nd number: 21/63
45/12 + 21/63 is 49/12.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 63 is 252
Next, find the equivalent fraction of both fractional numbers with denominator 252 - For the 1st fraction, since 12 × 21 = 252,
45/12 = 45 × 21/12 × 21 = 945/252 - Likewise, for the 2nd fraction, since 63 × 4 = 252,
21/63 = 21 × 4/63 × 4 = 84/252 - Add the two like fractions:
945/252 + 84/252 = 945 + 84/252 = 1029/252 - 1029/252 simplified gives 49/12
- So, 45/12 + 21/63 = 49/12
In mixed form: 41/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/12+21/63 45/12+42/63 45/24+21/63 45/36+21/63 45/60+21/63 45/84+21/63