Answers

Add 21/14 and 84/81

1^st number: 1 7/14, 2^nd number: 1 3/81

21/14 + 84/81 is 137/54.

Steps for adding fractions

1. Find the least common denominator or LCM of the two denominators:
   LCM of 14 and 81 is 1134
   
   Next, find the equivalent fraction of both fractional numbers with denominator 1134
2. For the 1st fraction, since 14 × 81 = 1134,
   21/14 = 21 × 81/14 × 81 = 1701/1134
3. Likewise, for the 2nd fraction, since 81 × 14 = 1134,
   84/81 = 84 × 14/81 × 14 = 1176/1134
4. Add the two like fractions:
   1701/1134 + 1176/1134 = 1701 + 1176/1134 = 2877/1134
5. 2877/1134 simplified gives 137/54
6. So, 21/14 + 84/81 = 137/54
   In mixed form: 229/54

MathStep (Works offline)

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

Related: ⁴²/₁₄+⁸⁴/₈₁ ²¹/₂₈+⁸⁴/₈₁ ⁶³/₁₄+⁸⁴/₈₁ ²¹/₄₂+⁸⁴/₈₁ ²¹/₇₀+⁸⁴/₈₁ ²¹/₉₈+⁸⁴/₈₁

Add Fractions Calculator