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Subtract 48/90 from 15/40

15/40 - 48/90 is -19/120.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 40 and 90 is 360

    Next, find the equivalent fraction of both fractional numbers with denominator 360
  2. For the 1st fraction, since 40 × 9 = 360,
    15/40 = 15 × 9/40 × 9 = 135/360
  3. Likewise, for the 2nd fraction, since 90 × 4 = 360,
    48/90 = 48 × 4/90 × 4 = 192/360
  4. Subtract the two like fractions:
    135/360 - 192/360 = 135 - 192/360 = -57/360
  5. After reducing the fraction, the answer is -19/120

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