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Subtract 20/8 from 2/5

1st number: 2/5, 2nd number: 2 4/8

2/5 - 20/8 is -21/10.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 5 and 8 is 40

    Next, find the equivalent fraction of both fractional numbers with denominator 40
  2. For the 1st fraction, since 5 × 8 = 40,
    2/5 = 2 × 8/5 × 8 = 16/40
  3. Likewise, for the 2nd fraction, since 8 × 5 = 40,
    20/8 = 20 × 5/8 × 5 = 100/40
  4. Subtract the two like fractions:
    16/40 - 100/40 = 16 - 100/40 = -84/40
  5. After reducing the fraction, the answer is -21/10

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