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Subtract 35/45 from 6/21

6/21 - 35/45 is -31/63.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 45 is 315
  2. For the 1st fraction, since 21 × 15 = 315,
    6/21 = 6 × 15/21 × 15 = 90/315
  3. Likewise, for the 2nd fraction, since 45 × 7 = 315,
    35/45 = 35 × 7/45 × 7 = 245/315
  4. Subtract the two fractions:
    90/315 - 245/315 = 90 - 245/315 = -155/315
  5. After reducing the fraction, the answer is -31/63

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