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Subtract 18/48 from 21/70

21/70 - 18/48 is -3/40.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 70 and 48 is 1680
  2. For the 1st fraction, since 70 × 24 = 1680,
    21/70 = 21 × 24/70 × 24 = 504/1680
  3. Likewise, for the 2nd fraction, since 48 × 35 = 1680,
    18/48 = 18 × 35/48 × 35 = 630/1680
  4. Subtract the two fractions:
    504/1680 - 630/1680 = 504 - 630/1680 = -126/1680
  5. After reducing the fraction, the answer is -3/40

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