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Add 21/60 and 18/72

21/60 + 18/72 is 3/5.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 60 and 72 is 360

    Next, find the equivalent fraction of both fractional numbers with denominator 360
  2. For the 1st fraction, since 60 × 6 = 360,
    21/60 = 21 × 6/60 × 6 = 126/360
  3. Likewise, for the 2nd fraction, since 72 × 5 = 360,
    18/72 = 18 × 5/72 × 5 = 90/360
  4. Add the two like fractions:
    126/360 + 90/360 = 126 + 90/360 = 216/360
  5. 216/360 simplified gives 3/5
  6. So, 21/60 + 18/72 = 3/5

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