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Subtract 45/7 from 21/12

1st number: 1 9/12, 2nd number: 6 3/7

21/12 - 45/7 is -131/28.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 12 and 7 is 84

    Next, find the equivalent fraction of both fractional numbers with denominator 84
  2. For the 1st fraction, since 12 × 7 = 84,
    21/12 = 21 × 7/12 × 7 = 147/84
  3. Likewise, for the 2nd fraction, since 7 × 12 = 84,
    45/7 = 45 × 12/7 × 12 = 540/84
  4. Subtract the two like fractions:
    147/84 - 540/84 = 147 - 540/84 = -393/84
  5. After reducing the fraction, the answer is -131/28

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