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Add 12/20 and 18/21

12/20 + 18/21 is 51/35.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 20 and 21 is 420
  2. For the 1st fraction, since 20 × 21 = 420,
    12/20 = 12 × 21/20 × 21 = 252/420
  3. Likewise, for the 2nd fraction, since 21 × 20 = 420,
    18/21 = 18 × 20/21 × 20 = 360/420
  4. Add the two fractions:
    252/420 + 360/420 = 252 + 360/420 = 612/420
  5. 612/420 simplified gives 51/35
  6. So, 12/20 + 18/21 = 51/35
    In mixed form: 116/35

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