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Subtract 90/70 from 81/40

1st number: 2 1/40, 2nd number: 1 20/70

81/40 - 90/70 is 207/280.

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,
    90/70 = 90 × 4/70 × 4 = 360/280
  4. Subtract the two fractions:
    567/280 - 360/280 = 567 - 360/280 = 207/280

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