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Add 12/72 and 4/21

12/72 + 4/21 is 5/14.

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,
    12/72 = 12 × 7/72 × 7 = 84/504
  3. Likewise, for the 2nd fraction, since 21 × 24 = 504,
    4/21 = 4 × 24/21 × 24 = 96/504
  4. Add the two like fractions:
    84/504 + 96/504 = 84 + 96/504 = 180/504
  5. 180/504 simplified gives 5/14
  6. So, 12/72 + 4/21 = 5/14

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