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Add 8/20 and 21/42

8/20 + 21/42 is 9/10.

Steps for adding fractions

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

    Next, find the equivalent fraction of both fractional numbers with denominator 420
  2. For the 1st fraction, since 20 × 21 = 420,
    8/20 = 8 × 21/20 × 21 = 168/420
  3. Likewise, for the 2nd fraction, since 42 × 10 = 420,
    21/42 = 21 × 10/42 × 10 = 210/420
  4. Add the two like fractions:
    168/420 + 210/420 = 168 + 210/420 = 378/420
  5. 378/420 simplified gives 9/10
  6. So, 8/20 + 21/42 = 9/10

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