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Add 18/42 and 20/40

18/42 + 20/40 is 13/14.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 40 is 840
  2. For the 1st fraction, since 42 × 20 = 840,
    18/42 = 18 × 20/42 × 20 = 360/840
  3. Likewise, for the 2nd fraction, since 40 × 21 = 840,
    20/40 = 20 × 21/40 × 21 = 420/840
  4. Add the two fractions:
    360/840 + 420/840 = 360 + 420/840 = 780/840
  5. 780/840 simplified gives 13/14
  6. So, 18/42 + 20/40 = 13/14

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