Answers

Add 81/70 and 54/84

1^st number: 1 11/70, 2^nd number: 54/84

81/70 + 54/84 is 9/5.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 70 and 84 is 420
   
   Next, find the equivalent fraction of both fractional numbers with denominator 420
2. For the 1st fraction, since 70 × 6 = 420,
   81/70 = 81 × 6/70 × 6 = 486/420
3. Likewise, for the 2nd fraction, since 84 × 5 = 420,
   54/84 = 54 × 5/84 × 5 = 270/420
4. Add the two like fractions:
   486/420 + 270/420 = 486 + 270/420 = 756/420
5. 756/420 simplified gives 9/5
6. So, 81/70 + 54/84 = 9/5
   In mixed form: 14/5

MathStep (Works offline)

Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad

Related:

Add Fractions Calculator