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Subtract 3/20 from 21/4

1st number: 5 1/4, 2nd number: 3/20

21/4 - 3/20 is 51/10.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 4 and 20 is 20

    Next, find the equivalent fraction of both fractional numbers with denominator 20
  2. For the 1st fraction, since 4 × 5 = 20,
    21/4 = 21 × 5/4 × 5 = 105/20
  3. Likewise, for the 2nd fraction, since 20 × 1 = 20,
    3/20 = 3 × 1/20 × 1 = 3/20
  4. Subtract the two like fractions:
    105/20 - 3/20 = 105 - 3/20 = 102/20
  5. After reducing the fraction, the answer is 51/10
  6. In mixed form: 51/10

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