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Add 1/21 and 12/18

1/21 + 12/18 is 5/7.

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,
    1/21 = 1 × 6/21 × 6 = 6/126
  3. Likewise, for the 2nd fraction, since 18 × 7 = 126,
    12/18 = 12 × 7/18 × 7 = 84/126
  4. Add the two like fractions:
    6/126 + 84/126 = 6 + 84/126 = 90/126
  5. 90/126 simplified gives 5/7
  6. So, 1/21 + 12/18 = 5/7

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