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Add 12/21 and 8/40

12/21 + 8/40 is 27/35.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 40 is 840
  2. For the 1st fraction, since 21 × 40 = 840,
    12/21 = 12 × 40/21 × 40 = 480/840
  3. Likewise, for the 2nd fraction, since 40 × 21 = 840,
    8/40 = 8 × 21/40 × 21 = 168/840
  4. Add the two fractions:
    480/840 + 168/840 = 480 + 168/840 = 648/840
  5. After reducing the fraction, the answer is 27/35

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