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Subtract 21/45 from 10/42

10/42 - 21/45 is -8/35.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 45 is 630
  2. For the 1st fraction, since 42 × 15 = 630,
    10/42 = 10 × 15/42 × 15 = 150/630
  3. Likewise, for the 2nd fraction, since 45 × 14 = 630,
    21/45 = 21 × 14/45 × 14 = 294/630
  4. Subtract the two fractions:
    150/630 - 294/630 = 150 - 294/630 = -144/630
  5. After reducing the fraction, the answer is -8/35

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