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Subtract 9/10 from 3/7

3/7 - 9/10 is -33/70.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 7 and 10 is 70
  2. For the 1st fraction, since 7 × 10 = 70,
    3/7 = 3 × 10/7 × 10 = 30/70
  3. Likewise, for the 2nd fraction, since 10 × 7 = 70,
    9/10 = 9 × 7/10 × 7 = 63/70
  4. Subtract the two fractions:
    30/70 - 63/70 = 30 - 63/70 = -33/70

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