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Add 21/40 and 9/42

21/40 + 9/42 is 207/280.

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,
    21/40 = 21 × 21/40 × 21 = 441/840
  3. Likewise, for the 2nd fraction, since 42 × 20 = 840,
    9/42 = 9 × 20/42 × 20 = 180/840
  4. Add the two like fractions:
    441/840 + 180/840 = 441 + 180/840 = 621/840
  5. 621/840 simplified gives 207/280
  6. So, 21/40 + 9/42 = 207/280

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