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Add 18/20 and 21/60

18/20 + 21/60 is 5/4.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 20 and 60 is 60
  2. For the 1st fraction, since 20 × 3 = 60,
    18/20 = 18 × 3/20 × 3 = 54/60
  3. Likewise, for the 2nd fraction, since 60 × 1 = 60,
    21/60 = 21 × 1/60 × 1 = 21/60
  4. Add the two fractions:
    54/60 + 21/60 = 54 + 21/60 = 75/60
  5. 75/60 simplified gives 5/4
  6. So, 18/20 + 21/60 = 5/4
    In mixed form: 11/4

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