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Subtract 18/4 from 25/21

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

25/21 - 18/4 is -139/42.

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,
    25/21 = 25 × 4/21 × 4 = 100/84
  3. Likewise, for the 2nd fraction, since 4 × 21 = 84,
    18/4 = 18 × 21/4 × 21 = 378/84
  4. Subtract the two like fractions:
    100/84 - 378/84 = 100 - 378/84 = -278/84
  5. After reducing the fraction, the answer is -139/42

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