Add 54/63 and 20/84
54/63 + 20/84 is 23/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 63 and 84 is 252
Next, find the equivalent fraction of both fractional numbers with denominator 252 - For the 1st fraction, since 63 × 4 = 252,
54/63 = 54 × 4/63 × 4 = 216/252 - Likewise, for the 2nd fraction, since 84 × 3 = 252,
20/84 = 20 × 3/84 × 3 = 60/252 - Add the two like fractions:
216/252 + 60/252 = 216 + 60/252 = 276/252 - 276/252 simplified gives 23/21
- So, 54/63 + 20/84 = 23/21
In mixed form: 12/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/63+40/84 54/63+60/84