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Add 21/84 and 21/45

21/84 + 21/45 is 43/60.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 84 and 45 is 1260
  2. For the 1st fraction, since 84 × 15 = 1260,
    21/84 = 21 × 15/84 × 15 = 315/1260
  3. Likewise, for the 2nd fraction, since 45 × 28 = 1260,
    21/45 = 21 × 28/45 × 28 = 588/1260
  4. Add the two fractions:
    315/1260 + 588/1260 = 315 + 588/1260 = 903/1260
  5. After reducing the fraction, the answer is 43/60

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