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Subtract 40/49 from 21/70

21/70 - 40/49 is -253/490.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 70 and 49 is 490
  2. For the 1st fraction, since 70 × 7 = 490,
    21/70 = 21 × 7/70 × 7 = 147/490
  3. Likewise, for the 2nd fraction, since 49 × 10 = 490,
    40/49 = 40 × 10/49 × 10 = 400/490
  4. Subtract the two fractions:
    147/490 - 400/490 = 147 - 400/490 = -253/490

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