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Add 18/72 and 16/21

18/72 + 16/21 is 85/84.

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,
    18/72 = 18 × 7/72 × 7 = 126/504
  3. Likewise, for the 2nd fraction, since 21 × 24 = 504,
    16/21 = 16 × 24/21 × 24 = 384/504
  4. Add the two like fractions:
    126/504 + 384/504 = 126 + 384/504 = 510/504
  5. 510/504 simplified gives 85/84
  6. So, 18/72 + 16/21 = 85/84
    In mixed form: 11/84

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