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Add 18/40 and 25/42

18/40 + 25/42 is 439/420.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 40 and 42 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 42 × 20 = 840,
    25/42 = 25 × 20/42 × 20 = 500/840
  4. Add the two like fractions:
    378/840 + 500/840 = 378 + 500/840 = 878/840
  5. 878/840 simplified gives 439/420
  6. So, 18/40 + 25/42 = 439/420
    In mixed form: 119/420

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