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Add 1/21 and 15/72

1/21 + 15/72 is 43/168.

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,
    1/21 = 1 × 24/21 × 24 = 24/504
  3. Likewise, for the 2nd fraction, since 72 × 7 = 504,
    15/72 = 15 × 7/72 × 7 = 105/504
  4. Add the two like fractions:
    24/504 + 105/504 = 24 + 105/504 = 129/504
  5. 129/504 simplified gives 43/168
  6. So, 1/21 + 15/72 = 43/168

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