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Add 21/40 and 3/80

21/40 + 3/80 is 9/16.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 40 and 80 is 80

    Next, find the equivalent fraction of both fractional numbers with denominator 80
  2. For the 1st fraction, since 40 × 2 = 80,
    21/40 = 21 × 2/40 × 2 = 42/80
  3. Likewise, for the 2nd fraction, since 80 × 1 = 80,
    3/80 = 3 × 1/80 × 1 = 3/80
  4. Add the two like fractions:
    42/80 + 3/80 = 42 + 3/80 = 45/80
  5. 45/80 simplified gives 9/16
  6. So, 21/40 + 3/80 = 9/16

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