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Add 10/21 and 21/63

10/21 + 21/63 is 17/21.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 63 is 63
  2. For the 1st fraction, since 21 × 3 = 63,
    10/21 = 10 × 3/21 × 3 = 30/63
  3. Likewise, for the 2nd fraction, since 63 × 1 = 63,
    21/63 = 21 × 1/63 × 1 = 21/63
  4. Add the two fractions:
    30/63 + 21/63 = 30 + 21/63 = 51/63
  5. After reducing the fraction, the answer is 17/21

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