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Subtract 63/70 from 9/20

9/20 - 63/70 is -9/20.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 20 and 70 is 140
  2. For the 1st fraction, since 20 × 7 = 140,
    9/20 = 9 × 7/20 × 7 = 63/140
  3. Likewise, for the 2nd fraction, since 70 × 2 = 140,
    63/70 = 63 × 2/70 × 2 = 126/140
  4. Subtract the two fractions:
    63/140 - 126/140 = 63 - 126/140 = -63/140
  5. After reducing the fraction, the answer is -9/20

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