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Add 15/28 and 18/40

15/28 + 18/40 is 69/70.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 28 and 40 is 280
  2. For the 1st fraction, since 28 × 10 = 280,
    15/28 = 15 × 10/28 × 10 = 150/280
  3. Likewise, for the 2nd fraction, since 40 × 7 = 280,
    18/40 = 18 × 7/40 × 7 = 126/280
  4. Add the two fractions:
    150/280 + 126/280 = 150 + 126/280 = 276/280
  5. After reducing the fraction, the answer is 69/70

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