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Subtract 18/70 from 81/40

1st number: 2 1/40, 2nd number: 18/70

81/40 - 18/70 is 99/56.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 40 and 70 is 280
  2. For the 1st fraction, since 40 × 7 = 280,
    81/40 = 81 × 7/40 × 7 = 567/280
  3. Likewise, for the 2nd fraction, since 70 × 4 = 280,
    18/70 = 18 × 4/70 × 4 = 72/280
  4. Subtract the two fractions:
    567/280 - 72/280 = 567 - 72/280 = 495/280
  5. After reducing the fraction, the answer is 99/56
  6. In mixed form: 143/56

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