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Add 9/21 and 21/72

9/21 + 21/72 is 121/168.

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,
    9/21 = 9 × 24/21 × 24 = 216/504
  3. Likewise, for the 2nd fraction, since 72 × 7 = 504,
    21/72 = 21 × 7/72 × 7 = 147/504
  4. Add the two like fractions:
    216/504 + 147/504 = 216 + 147/504 = 363/504
  5. 363/504 simplified gives 121/168
  6. So, 9/21 + 21/72 = 121/168

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