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Subtract 36/72 from 21/70

21/70 - 36/72 is -1/5.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 70 and 72 is 2520
  2. For the 1st fraction, since 70 × 36 = 2520,
    21/70 = 21 × 36/70 × 36 = 756/2520
  3. Likewise, for the 2nd fraction, since 72 × 35 = 2520,
    36/72 = 36 × 35/72 × 35 = 1260/2520
  4. Subtract the two fractions:
    756/2520 - 1260/2520 = 756 - 1260/2520 = -504/2520
  5. After reducing the fraction, the answer is -1/5

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