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Add 21/30 and 18/72

21/30 + 18/72 is 19/20.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 30 and 72 is 360
  2. For the 1st fraction, since 30 × 12 = 360,
    21/30 = 21 × 12/30 × 12 = 252/360
  3. Likewise, for the 2nd fraction, since 72 × 5 = 360,
    18/72 = 18 × 5/72 × 5 = 90/360
  4. Add the two fractions:
    252/360 + 90/360 = 252 + 90/360 = 342/360
  5. 342/360 simplified gives 19/20
  6. So, 21/30 + 18/72 = 19/20

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