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Add 1/21 and 4/63

1/21 + 4/63 is 1/9.

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,
    1/21 = 1 × 3/21 × 3 = 3/63
  3. Likewise, for the 2nd fraction, since 63 × 1 = 63,
    4/63 = 4 × 1/63 × 1 = 4/63
  4. Add the two fractions:
    3/63 + 4/63 = 3 + 4/63 = 7/63
  5. After reducing the fraction, the answer is 1/9

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