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Add 12/40 and 28/42

12/40 + 28/42 is 29/30.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 40 and 42 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 42 × 20 = 840,
    28/42 = 28 × 20/42 × 20 = 560/840
  4. Add the two fractions:
    252/840 + 560/840 = 252 + 560/840 = 812/840
  5. 812/840 simplified gives 29/30
  6. So, 12/40 + 28/42 = 29/30

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