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Add 5/21 and 9/18

5/21 + 9/18 is 31/42.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 18 is 126

    Next, find the equivalent fraction of both fractional numbers with denominator 126
  2. For the 1st fraction, since 21 × 6 = 126,
    5/21 = 5 × 6/21 × 6 = 30/126
  3. Likewise, for the 2nd fraction, since 18 × 7 = 126,
    9/18 = 9 × 7/18 × 7 = 63/126
  4. Add the two like fractions:
    30/126 + 63/126 = 30 + 63/126 = 93/126
  5. 93/126 simplified gives 31/42
  6. So, 5/21 + 9/18 = 31/42

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