Add 54/84 and 42/30
1st number: 54/84, 2nd number: 1 12/30
54/84 + 42/30 is 143/70.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 30 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 84 × 5 = 420,
54/84 = 54 × 5/84 × 5 = 270/420 - Likewise, for the 2nd fraction, since 30 × 14 = 420,
42/30 = 42 × 14/30 × 14 = 588/420 - Add the two like fractions:
270/420 + 588/420 = 270 + 588/420 = 858/420 - 858/420 simplified gives 143/70
- So, 54/84 + 42/30 = 143/70
In mixed form: 23/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/84+84/30 54/84+42/60 54/84+42/90