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Add 21/84 and 9/10

21/84 + 9/10 is 23/20.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 84 and 10 is 420
  2. For the 1st fraction, since 84 × 5 = 420,
    21/84 = 21 × 5/84 × 5 = 105/420
  3. Likewise, for the 2nd fraction, since 10 × 42 = 420,
    9/10 = 9 × 42/10 × 42 = 378/420
  4. Add the two fractions:
    105/420 + 378/420 = 105 + 378/420 = 483/420
  5. After reducing the fraction, the answer is 23/20
  6. In mixed form: 13/20

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