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Add 9/21 and 7/20

9/21 + 7/20 is 109/140.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 20 is 420

    Next, find the equivalent fraction of both fractional numbers with denominator 420
  2. For the 1st fraction, since 21 × 20 = 420,
    9/21 = 9 × 20/21 × 20 = 180/420
  3. Likewise, for the 2nd fraction, since 20 × 21 = 420,
    7/20 = 7 × 21/20 × 21 = 147/420
  4. Add the two like fractions:
    180/420 + 147/420 = 180 + 147/420 = 327/420
  5. 327/420 simplified gives 109/140
  6. So, 9/21 + 7/20 = 109/140

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