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Add 7/21 and 42/27

1st number: 7/21, 2nd number: 1 15/27

7/21 + 42/27 is 17/9.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 27 is 189
  2. For the 1st fraction, since 21 × 9 = 189,
    7/21 = 7 × 9/21 × 9 = 63/189
  3. Likewise, for the 2nd fraction, since 27 × 7 = 189,
    42/27 = 42 × 7/27 × 7 = 294/189
  4. Add the two fractions:
    63/189 + 294/189 = 63 + 294/189 = 357/189
  5. After reducing the fraction, the answer is 17/9
  6. In mixed form: 18/9

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