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Add 21/42 and 9/20

21/42 + 9/20 is 19/20.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 20 is 420

    Next, find the equivalent fraction of both fractional numbers with denominator 420
  2. For the 1st fraction, since 42 × 10 = 420,
    21/42 = 21 × 10/42 × 10 = 210/420
  3. Likewise, for the 2nd fraction, since 20 × 21 = 420,
    9/20 = 9 × 21/20 × 21 = 189/420
  4. Add the two like fractions:
    210/420 + 189/420 = 210 + 189/420 = 399/420
  5. 399/420 simplified gives 19/20
  6. So, 21/42 + 9/20 = 19/20

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