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Add 21/42 and 5/18

21/42 + 5/18 is 7/9.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 18 is 126
  2. For the 1st fraction, since 42 × 3 = 126,
    21/42 = 21 × 3/42 × 3 = 63/126
  3. Likewise, for the 2nd fraction, since 18 × 7 = 126,
    5/18 = 5 × 7/18 × 7 = 35/126
  4. Add the two fractions:
    63/126 + 35/126 = 63 + 35/126 = 98/126
  5. After reducing the fraction, the answer is 7/9

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