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Add 18/40 and 15/84

18/40 + 15/84 is 22/35.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 40 and 84 is 840
  2. For the 1st fraction, since 40 × 21 = 840,
    18/40 = 18 × 21/40 × 21 = 378/840
  3. Likewise, for the 2nd fraction, since 84 × 10 = 840,
    15/84 = 15 × 10/84 × 10 = 150/840
  4. Add the two fractions:
    378/840 + 150/840 = 378 + 150/840 = 528/840
  5. 528/840 simplified gives 22/35
  6. So, 18/40 + 15/84 = 22/35

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