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Subtract 21/42 from 20/15

1st number: 1 5/15, 2nd number: 21/42

20/15 - 21/42 is 5/6.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 15 and 42 is 210
  2. For the 1st fraction, since 15 × 14 = 210,
    20/15 = 20 × 14/15 × 14 = 280/210
  3. Likewise, for the 2nd fraction, since 42 × 5 = 210,
    21/42 = 21 × 5/42 × 5 = 105/210
  4. Subtract the two fractions:
    280/210 - 105/210 = 280 - 105/210 = 175/210
  5. After reducing the fraction, the answer is 5/6

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