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Add 30/72 and 8/21

30/72 + 8/21 is 67/84.

Steps for adding fractions

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

    Next, find the equivalent fraction of both fractional numbers with denominator 504
  2. For the 1st fraction, since 72 × 7 = 504,
    30/72 = 30 × 7/72 × 7 = 210/504
  3. Likewise, for the 2nd fraction, since 21 × 24 = 504,
    8/21 = 8 × 24/21 × 24 = 192/504
  4. Add the two like fractions:
    210/504 + 192/504 = 210 + 192/504 = 402/504
  5. 402/504 simplified gives 67/84
  6. So, 30/72 + 8/21 = 67/84

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