Add 42/84 and 20/54
42/84 + 20/54 is 47/54.
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,
42/84 = 42 × 9/84 × 9 = 378/756 - Likewise, for the 2nd fraction, since 54 × 14 = 756,
20/54 = 20 × 14/54 × 14 = 280/756 - Add the two like fractions:
378/756 + 280/756 = 378 + 280/756 = 658/756 - 658/756 simplified gives 47/54
- So, 42/84 + 20/54 = 47/54
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/84+40/54 42/84+60/54