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Subtract 21/7 from 7/20

1st number: 7/20, 2nd number: 3 0/7

7/20 - 21/7 is -53/20.

Steps for subtracting fractions

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

    Next, find the equivalent fraction of both fractional numbers with denominator 140
  2. For the 1st fraction, since 20 × 7 = 140,
    7/20 = 7 × 7/20 × 7 = 49/140
  3. Likewise, for the 2nd fraction, since 7 × 20 = 140,
    21/7 = 21 × 20/7 × 20 = 420/140
  4. Subtract the two like fractions:
    49/140 - 420/140 = 49 - 420/140 = -371/140
  5. After reducing the fraction, the answer is -53/20

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