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Add 12/40 and 6/21

12/40 + 6/21 is 41/70.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 40 and 21 is 840
  2. For the 1st fraction, since 40 × 21 = 840,
    12/40 = 12 × 21/40 × 21 = 252/840
  3. Likewise, for the 2nd fraction, since 21 × 40 = 840,
    6/21 = 6 × 40/21 × 40 = 240/840
  4. Add the two fractions:
    252/840 + 240/840 = 252 + 240/840 = 492/840
  5. 492/840 simplified gives 41/70
  6. So, 12/40 + 6/21 = 41/70

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