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Add 18/40 and 30/84

18/40 + 30/84 is 113/140.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 40 and 84 is 840

    Next, find the equivalent fraction of both fractional numbers with denominator 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,
    30/84 = 30 × 10/84 × 10 = 300/840
  4. Add the two like fractions:
    378/840 + 300/840 = 378 + 300/840 = 678/840
  5. 678/840 simplified gives 113/140
  6. So, 18/40 + 30/84 = 113/140

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