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Add 21/27 and 42/60

21/27 + 42/60 is 133/90.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 27 and 60 is 540

    Next, find the equivalent fraction of both fractional numbers with denominator 540
  2. For the 1st fraction, since 27 × 20 = 540,
    21/27 = 21 × 20/27 × 20 = 420/540
  3. Likewise, for the 2nd fraction, since 60 × 9 = 540,
    42/60 = 42 × 9/60 × 9 = 378/540
  4. Add the two like fractions:
    420/540 + 378/540 = 420 + 378/540 = 798/540
  5. 798/540 simplified gives 133/90
  6. So, 21/27 + 42/60 = 133/90
    In mixed form: 143/90

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