Add 30/84 and 21/54
30/84 + 21/54 is 47/63.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 54 is 756
Next, find the equivalent fraction of both fractional numbers with denominator 756 - For the 1st fraction, since 84 × 9 = 756,
30/84 = 30 × 9/84 × 9 = 270/756 - Likewise, for the 2nd fraction, since 54 × 14 = 756,
21/54 = 21 × 14/54 × 14 = 294/756 - Add the two like fractions:
270/756 + 294/756 = 270 + 294/756 = 564/756 - 564/756 simplified gives 47/63
- So, 30/84 + 21/54 = 47/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/84+21/54 30/84+42/54 90/84+21/54 30/84+63/54