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Subtract 28/40 from 20/9

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

20/9 - 28/40 is 137/90.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 9 and 40 is 360

    Next, find the equivalent fraction of both fractional numbers with denominator 360
  2. For the 1st fraction, since 9 × 40 = 360,
    20/9 = 20 × 40/9 × 40 = 800/360
  3. Likewise, for the 2nd fraction, since 40 × 9 = 360,
    28/40 = 28 × 9/40 × 9 = 252/360
  4. Subtract the two like fractions:
    800/360 - 252/360 = 800 - 252/360 = 548/360
  5. After reducing the fraction, the answer is 137/90
  6. In mixed form: 147/90

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