Add 21/84 and 9/63
21/84 + 9/63 is 11/28.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 63 is 252
Next, find the equivalent fraction of both fractional numbers with denominator 252 - For the 1st fraction, since 84 × 3 = 252,
21/84 = 21 × 3/84 × 3 = 63/252 - Likewise, for the 2nd fraction, since 63 × 4 = 252,
9/63 = 9 × 4/63 × 4 = 36/252 - Add the two like fractions:
63/252 + 36/252 = 63 + 36/252 = 99/252 - 99/252 simplified gives 11/28
- So, 21/84 + 9/63 = 11/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/84+9/63 21/84+18/63 63/84+9/63 21/84+27/63 21/84+45/63