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Add 15/42 and 8/20

15/42 + 8/20 is 53/70.

Steps for adding fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 20 is 420
  2. For the 1st fraction, since 42 × 10 = 420,
    15/42 = 15 × 10/42 × 10 = 150/420
  3. Likewise, for the 2nd fraction, since 20 × 21 = 420,
    8/20 = 8 × 21/20 × 21 = 168/420
  4. Add the two fractions:
    150/420 + 168/420 = 150 + 168/420 = 318/420
  5. After reducing the fraction, the answer is 53/70

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