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Add 21/42 and 49/72

21/42 + 49/72 is 85/72.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 72 is 504

    Next, find the equivalent fraction of both fractional numbers with denominator 504
  2. For the 1st fraction, since 42 × 12 = 504,
    21/42 = 21 × 12/42 × 12 = 252/504
  3. Likewise, for the 2nd fraction, since 72 × 7 = 504,
    49/72 = 49 × 7/72 × 7 = 343/504
  4. Add the two like fractions:
    252/504 + 343/504 = 252 + 343/504 = 595/504
  5. 595/504 simplified gives 85/72
  6. So, 21/42 + 49/72 = 85/72
    In mixed form: 113/72

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