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Add 7/21 and 21/63

7/21 + 21/63 is 2/3.

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,
    7/21 = 7 × 3/21 × 3 = 21/63
  3. Likewise, for the 2nd fraction, since 63 × 1 = 63,
    21/63 = 21 × 1/63 × 1 = 21/63
  4. Add the two fractions:
    21/63 + 21/63 = 21 + 21/63 = 42/63
  5. 42/63 simplified gives 2/3
  6. So, 7/21 + 21/63 = 2/3

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