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Subtract 40/7 from 90/21

1st number: 4 6/21, 2nd number: 5 5/7

90/21 - 40/7 is -10/7.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 7 is 21
  2. For the 1st fraction, since 21 × 1 = 21,
    90/21 = 90 × 1/21 × 1 = 90/21
  3. Likewise, for the 2nd fraction, since 7 × 3 = 21,
    40/7 = 40 × 3/7 × 3 = 120/21
  4. Subtract the two fractions:
    90/21 - 120/21 = 90 - 120/21 = -30/21
  5. After reducing the fraction, the answer is -10/7

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