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Subtract 9/10 from 2/7

2/7 - 9/10 is -43/70.

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,
    2/7 = 2 × 10/7 × 10 = 20/70
  3. Likewise, for the 2nd fraction, since 10 × 7 = 70,
    9/10 = 9 × 7/10 × 7 = 63/70
  4. Subtract the two fractions:
    20/70 - 63/70 = 20 - 63/70 = -43/70

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