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Subtract 21/20 from 7/16

1st number: 7/16, 2nd number: 1 1/20

7/16 - 21/20 is -49/80.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 16 and 20 is 80

    Next, find the equivalent fraction of both fractional numbers with denominator 80
  2. For the 1st fraction, since 16 × 5 = 80,
    7/16 = 7 × 5/16 × 5 = 35/80
  3. Likewise, for the 2nd fraction, since 20 × 4 = 80,
    21/20 = 21 × 4/20 × 4 = 84/80
  4. Subtract the two like fractions:
    35/80 - 84/80 = 35 - 84/80 = -49/80

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