Add 20/12 and 28/63
1st number: 1 8/12, 2nd number: 28/63
20/12 + 28/63 is 19/9.
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,
20/12 = 20 × 21/12 × 21 = 420/252 - Likewise, for the 2nd fraction, since 63 × 4 = 252,
28/63 = 28 × 4/63 × 4 = 112/252 - Add the two like fractions:
420/252 + 112/252 = 420 + 112/252 = 532/252 - 532/252 simplified gives 19/9
- So, 20/12 + 28/63 = 19/9
In mixed form: 21/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/12+28/63 20/12+56/63 20/24+28/63 60/12+28/63 20/12+84/63 20/36+28/63 20/60+28/63 20/84+28/63