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Add 15/40 and 10/42

15/40 + 10/42 is 103/168.

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,
    15/40 = 15 × 21/40 × 21 = 315/840
  3. Likewise, for the 2nd fraction, since 42 × 20 = 840,
    10/42 = 10 × 20/42 × 20 = 200/840
  4. Add the two fractions:
    315/840 + 200/840 = 315 + 200/840 = 515/840
  5. 515/840 simplified gives 103/168
  6. So, 15/40 + 10/42 = 103/168

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