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Add 25/42 and 20/40

25/42 + 20/40 is 23/21.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 40 is 840

    Next, find the equivalent fraction of both fractional numbers with denominator 840
  2. For the 1st fraction, since 42 × 20 = 840,
    25/42 = 25 × 20/42 × 20 = 500/840
  3. Likewise, for the 2nd fraction, since 40 × 21 = 840,
    20/40 = 20 × 21/40 × 21 = 420/840
  4. Add the two like fractions:
    500/840 + 420/840 = 500 + 420/840 = 920/840
  5. 920/840 simplified gives 23/21
  6. So, 25/42 + 20/40 = 23/21
    In mixed form: 12/21

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