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Add 21/84 and 45/20

1st number: 21/84, 2nd number: 2 5/20

21/84 + 45/20 is 5/2.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 84 and 20 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 20 × 21 = 420,
    45/20 = 45 × 21/20 × 21 = 945/420
  4. Add the two fractions:
    105/420 + 945/420 = 105 + 945/420 = 1050/420
  5. 1050/420 simplified gives 5/2
  6. So, 21/84 + 45/20 = 5/2
    In mixed form: 21/2

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