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Add 18/21 and 30/72

18/21 + 30/72 is 107/84.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 72 is 504

    Next, find the equivalent fraction of both fractional numbers with denominator 504
  2. For the 1st fraction, since 21 × 24 = 504,
    18/21 = 18 × 24/21 × 24 = 432/504
  3. Likewise, for the 2nd fraction, since 72 × 7 = 504,
    30/72 = 30 × 7/72 × 7 = 210/504
  4. Add the two like fractions:
    432/504 + 210/504 = 432 + 210/504 = 642/504
  5. 642/504 simplified gives 107/84
  6. So, 18/21 + 30/72 = 107/84
    In mixed form: 123/84

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