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Subtract 21/20 from 5/7

1st number: 5/7, 2nd number: 1 1/20

5/7 - 21/20 is -47/140.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 7 and 20 is 140

    Next, find the equivalent fraction of both fractional numbers with denominator 140
  2. For the 1st fraction, since 7 × 20 = 140,
    5/7 = 5 × 20/7 × 20 = 100/140
  3. Likewise, for the 2nd fraction, since 20 × 7 = 140,
    21/20 = 21 × 7/20 × 7 = 147/140
  4. Subtract the two like fractions:
    100/140 - 147/140 = 100 - 147/140 = -47/140

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