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Add 1/21 and 70/72

1/21 + 70/72 is 257/252.

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,
    70/72 = 70 × 7/72 × 7 = 490/504
  4. Add the two like fractions:
    24/504 + 490/504 = 24 + 490/504 = 514/504
  5. 514/504 simplified gives 257/252
  6. So, 1/21 + 70/72 = 257/252
    In mixed form: 15/252

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