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Subtract 70/9 from 28/40

1st number: 28/40, 2nd number: 7 7/9

28/40 - 70/9 is -637/90.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 40 and 9 is 360
  2. For the 1st fraction, since 40 × 9 = 360,
    28/40 = 28 × 9/40 × 9 = 252/360
  3. Likewise, for the 2nd fraction, since 9 × 40 = 360,
    70/9 = 70 × 40/9 × 40 = 2800/360
  4. Subtract the two fractions:
    252/360 - 2800/360 = 252 - 2800/360 = -2548/360
  5. After reducing the fraction, the answer is -637/90

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