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Add 25/40 and 21/42

25/40 + 21/42 is 9/8.

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,
    25/40 = 25 × 21/40 × 21 = 525/840
  3. Likewise, for the 2nd fraction, since 42 × 20 = 840,
    21/42 = 21 × 20/42 × 20 = 420/840
  4. Add the two like fractions:
    525/840 + 420/840 = 525 + 420/840 = 945/840
  5. 945/840 simplified gives 9/8
  6. So, 25/40 + 21/42 = 9/8
    In mixed form: 11/8

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