Add 45/63 and 20/12
1st number: 45/63, 2nd number: 1 8/12
45/63 + 20/12 is 50/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 63 and 12 is 252
Next, find the equivalent fraction of both fractional numbers with denominator 252 - For the 1st fraction, since 63 × 4 = 252,
45/63 = 45 × 4/63 × 4 = 180/252 - Likewise, for the 2nd fraction, since 12 × 21 = 252,
20/12 = 20 × 21/12 × 21 = 420/252 - Add the two like fractions:
180/252 + 420/252 = 180 + 420/252 = 600/252 - 600/252 simplified gives 50/21
- So, 45/63 + 20/12 = 50/21
In mixed form: 28/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/63+20/12 45/63+40/12 45/63+20/24 45/63+60/12 45/63+20/36 45/63+20/60 45/63+20/84