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Subtract 21/42 from 10/15

10/15 - 21/42 is 1/6.

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,
    10/15 = 10 × 14/15 × 14 = 140/210
  3. Likewise, for the 2nd fraction, since 42 × 5 = 210,
    21/42 = 21 × 5/42 × 5 = 105/210
  4. Subtract the two fractions:
    140/210 - 105/210 = 140 - 105/210 = 35/210
  5. After reducing the fraction, the answer is 1/6

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