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Add 4/7 and 21/81

4/7 + 21/81 is 157/189.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 7 and 81 is 567
  2. For the 1st fraction, since 7 × 81 = 567,
    4/7 = 4 × 81/7 × 81 = 324/567
  3. Likewise, for the 2nd fraction, since 81 × 7 = 567,
    21/81 = 21 × 7/81 × 7 = 147/567
  4. Add the two fractions:
    324/567 + 147/567 = 324 + 147/567 = 471/567
  5. After reducing the fraction, the answer is 157/189

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