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Subtract 20/5 from 21/16

1st number: 1 5/16, 2nd number: 4 0/5

21/16 - 20/5 is -43/16.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 16 and 5 is 80

    Next, find the equivalent fraction of both fractional numbers with denominator 80
  2. For the 1st fraction, since 16 × 5 = 80,
    21/16 = 21 × 5/16 × 5 = 105/80
  3. Likewise, for the 2nd fraction, since 5 × 16 = 80,
    20/5 = 20 × 16/5 × 16 = 320/80
  4. Subtract the two like fractions:
    105/80 - 320/80 = 105 - 320/80 = -215/80
  5. After reducing the fraction, the answer is -43/16

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