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Add 21/90 and 90/81

1st number: 21/90, 2nd number: 1 9/81

21/90 + 90/81 is 121/90.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 90 and 81 is 810
  2. For the 1st fraction, since 90 × 9 = 810,
    21/90 = 21 × 9/90 × 9 = 189/810
  3. Likewise, for the 2nd fraction, since 81 × 10 = 810,
    90/81 = 90 × 10/81 × 10 = 900/810
  4. Add the two fractions:
    189/810 + 900/810 = 189 + 900/810 = 1089/810
  5. After reducing the fraction, the answer is 121/90
  6. In mixed form: 131/90

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