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Add 10/20 and 9/42

10/20 + 9/42 is 5/7.

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,
    10/20 = 10 × 21/20 × 21 = 210/420
  3. Likewise, for the 2nd fraction, since 42 × 10 = 420,
    9/42 = 9 × 10/42 × 10 = 90/420
  4. Add the two like fractions:
    210/420 + 90/420 = 210 + 90/420 = 300/420
  5. 300/420 simplified gives 5/7
  6. So, 10/20 + 9/42 = 5/7

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