Answers

Add 6/81 and 21/8

1^st number: 6/81, 2^nd number: 2 5/8

6/81 + 21/8 is 583/216.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 81 and 8 is 648
   
   Next, find the equivalent fraction of both fractional numbers with denominator 648
2. For the 1st fraction, since 81 × 8 = 648,
   6/81 = 6 × 8/81 × 8 = 48/648
3. Likewise, for the 2nd fraction, since 8 × 81 = 648,
   21/8 = 21 × 81/8 × 81 = 1701/648
4. Add the two like fractions:
   48/648 + 1701/648 = 48 + 1701/648 = 1749/648
5. 1749/648 simplified gives 583/216
6. So, 6/81 + 21/8 = 583/216
   In mixed form: 2151/216

MathStep (Works offline)

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

Related: ¹²/₈₁+²¹/₈ ⁶/₈₁+⁴²/₈ ⁶/₈₁+²¹/₁₆ ¹⁸/₈₁+²¹/₈ ⁶/₈₁+⁶³/₈ ⁶/₈₁+²¹/₂₄ ³⁰/₈₁+²¹/₈ ⁶/₈₁+²¹/₄₀ ⁴²/₈₁+²¹/₈ ⁶/₈₁+²¹/₅₆

Add Fractions Calculator