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Subtract 90/7 from 9/20

1st number: 9/20, 2nd number: 12 6/7

9/20 - 90/7 is -1737/140.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 20 and 7 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 7 × 20 = 140,
    90/7 = 90 × 20/7 × 20 = 1800/140
  4. Subtract the two fractions:
    63/140 - 1800/140 = 63 - 1800/140 = -1737/140

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