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Add 12/21 and 6/45

12/21 + 6/45 is 74/105.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 45 is 315
  2. For the 1st fraction, since 21 × 15 = 315,
    12/21 = 12 × 15/21 × 15 = 180/315
  3. Likewise, for the 2nd fraction, since 45 × 7 = 315,
    6/45 = 6 × 7/45 × 7 = 42/315
  4. Add the two fractions:
    180/315 + 42/315 = 180 + 42/315 = 222/315
  5. After reducing the fraction, the answer is 74/105

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