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Add 7/21 and 42/45

7/21 + 42/45 is 19/15.

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,
    7/21 = 7 × 15/21 × 15 = 105/315
  3. Likewise, for the 2nd fraction, since 45 × 7 = 315,
    42/45 = 42 × 7/45 × 7 = 294/315
  4. Add the two fractions:
    105/315 + 294/315 = 105 + 294/315 = 399/315
  5. After reducing the fraction, the answer is 19/15
  6. In mixed form: 14/15

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