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Subtract 40/70 from 10/21

10/21 - 40/70 is -2/21.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 70 is 210
  2. For the 1st fraction, since 21 × 10 = 210,
    10/21 = 10 × 10/21 × 10 = 100/210
  3. Likewise, for the 2nd fraction, since 70 × 3 = 210,
    40/70 = 40 × 3/70 × 3 = 120/210
  4. Subtract the two fractions:
    100/210 - 120/210 = 100 - 120/210 = -20/210
  5. After reducing the fraction, the answer is -2/21

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