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Add 15/42 and 16/20

15/42 + 16/20 is 81/70.

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,
    16/20 = 16 × 21/20 × 21 = 336/420
  4. Add the two fractions:
    150/420 + 336/420 = 150 + 336/420 = 486/420
  5. 486/420 simplified gives 81/70
  6. So, 15/42 + 16/20 = 81/70
    In mixed form: 111/70

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