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Subtract 25/7 from 18/21

1st number: 18/21, 2nd number: 3 4/7

18/21 - 25/7 is -19/7.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 7 is 21

    Next, find the equivalent fraction of both fractional numbers with denominator 21
  2. For the 1st fraction, since 21 × 1 = 21,
    18/21 = 18 × 1/21 × 1 = 18/21
  3. Likewise, for the 2nd fraction, since 7 × 3 = 21,
    25/7 = 25 × 3/7 × 3 = 75/21
  4. Subtract the two like fractions:
    18/21 - 75/21 = 18 - 75/21 = -57/21
  5. After reducing the fraction, the answer is -19/7

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