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Subtract 30/4 from 5/21

1st number: 5/21, 2nd number: 7 2/4

5/21 - 30/4 is -305/42.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 4 is 84

    Next, find the equivalent fraction of both fractional numbers with denominator 84
  2. For the 1st fraction, since 21 × 4 = 84,
    5/21 = 5 × 4/21 × 4 = 20/84
  3. Likewise, for the 2nd fraction, since 4 × 21 = 84,
    30/4 = 30 × 21/4 × 21 = 630/84
  4. Subtract the two like fractions:
    20/84 - 630/84 = 20 - 630/84 = -610/84
  5. After reducing the fraction, the answer is -305/42

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