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Add 15/84 and 9/40

15/84 + 9/40 is 113/280.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 84 and 40 is 840
  2. For the 1st fraction, since 84 × 10 = 840,
    15/84 = 15 × 10/84 × 10 = 150/840
  3. Likewise, for the 2nd fraction, since 40 × 21 = 840,
    9/40 = 9 × 21/40 × 21 = 189/840
  4. Add the two fractions:
    150/840 + 189/840 = 150 + 189/840 = 339/840
  5. After reducing the fraction, the answer is 113/280

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