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Subtract 40/35 from 10/21

1st number: 10/21, 2nd number: 1 5/35

10/21 - 40/35 is -2/3.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 35 is 105
  2. For the 1st fraction, since 21 × 5 = 105,
    10/21 = 10 × 5/21 × 5 = 50/105
  3. Likewise, for the 2nd fraction, since 35 × 3 = 105,
    40/35 = 40 × 3/35 × 3 = 120/105
  4. Subtract the two fractions:
    50/105 - 120/105 = 50 - 120/105 = -70/105
  5. After reducing the fraction, the answer is -2/3

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