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Add 8/21 and 21/72

8/21 + 21/72 is 113/168.

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,
    8/21 = 8 × 24/21 × 24 = 192/504
  3. Likewise, for the 2nd fraction, since 72 × 7 = 504,
    21/72 = 21 × 7/72 × 7 = 147/504
  4. Add the two like fractions:
    192/504 + 147/504 = 192 + 147/504 = 339/504
  5. 339/504 simplified gives 113/168
  6. So, 8/21 + 21/72 = 113/168

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