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Subtract 40/28 from 10/21

1st number: 10/21, 2nd number: 1 12/28

10/21 - 40/28 is -20/21.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 28 is 84
  2. For the 1st fraction, since 21 × 4 = 84,
    10/21 = 10 × 4/21 × 4 = 40/84
  3. Likewise, for the 2nd fraction, since 28 × 3 = 84,
    40/28 = 40 × 3/28 × 3 = 120/84
  4. Subtract the two fractions:
    40/84 - 120/84 = 40 - 120/84 = -80/84
  5. After reducing the fraction, the answer is -20/21

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