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Add 18/20 and 15/84

18/20 + 15/84 is 151/140.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 20 and 84 is 420
  2. For the 1st fraction, since 20 × 21 = 420,
    18/20 = 18 × 21/20 × 21 = 378/420
  3. Likewise, for the 2nd fraction, since 84 × 5 = 420,
    15/84 = 15 × 5/84 × 5 = 75/420
  4. Add the two fractions:
    378/420 + 75/420 = 378 + 75/420 = 453/420
  5. After reducing the fraction, the answer is 151/140
  6. In mixed form: 111/140

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