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Add 9/42 and 7/20

9/42 + 7/20 is 79/140.

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,
    9/42 = 9 × 10/42 × 10 = 90/420
  3. Likewise, for the 2nd fraction, since 20 × 21 = 420,
    7/20 = 7 × 21/20 × 21 = 147/420
  4. Add the two like fractions:
    90/420 + 147/420 = 90 + 147/420 = 237/420
  5. 237/420 simplified gives 79/140
  6. So, 9/42 + 7/20 = 79/140

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