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Add 63/84 and 42/21

1st number: 63/84, 2nd number: 2 0/21

63/84 + 42/21 is 11/4.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 84 and 21 is 84
  2. For the 1st fraction, since 84 × 1 = 84,
    63/84 = 63 × 1/84 × 1 = 63/84
  3. Likewise, for the 2nd fraction, since 21 × 4 = 84,
    42/21 = 42 × 4/21 × 4 = 168/84
  4. Add the two fractions:
    63/84 + 168/84 = 63 + 168/84 = 231/84
  5. 231/84 simplified gives 11/4
  6. So, 63/84 + 42/21 = 11/4
    In mixed form: 23/4

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