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Subtract 64/40 from 20/90

1st number: 20/90, 2nd number: 1 24/40

20/90 - 64/40 is -62/45.

Steps for subtracting fractions

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

    Next, find the equivalent fraction of both fractional numbers with denominator 360
  2. For the 1st fraction, since 90 × 4 = 360,
    20/90 = 20 × 4/90 × 4 = 80/360
  3. Likewise, for the 2nd fraction, since 40 × 9 = 360,
    64/40 = 64 × 9/40 × 9 = 576/360
  4. Subtract the two like fractions:
    80/360 - 576/360 = 80 - 576/360 = -496/360
  5. After reducing the fraction, the answer is -62/45

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