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Add 9/20 and 21/27

9/20 + 21/27 is 221/180.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 20 and 27 is 540

    Next, find the equivalent fraction of both fractional numbers with denominator 540
  2. For the 1st fraction, since 20 × 27 = 540,
    9/20 = 9 × 27/20 × 27 = 243/540
  3. Likewise, for the 2nd fraction, since 27 × 20 = 540,
    21/27 = 21 × 20/27 × 20 = 420/540
  4. Add the two like fractions:
    243/540 + 420/540 = 243 + 420/540 = 663/540
  5. 663/540 simplified gives 221/180
  6. So, 9/20 + 21/27 = 221/180
    In mixed form: 141/180

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