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Subtract 45/70 from 21/12

1st number: 1 9/12, 2nd number: 45/70

21/12 - 45/70 is 31/28.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 12 and 70 is 420

    Next, find the equivalent fraction of both fractional numbers with denominator 420
  2. For the 1st fraction, since 12 × 35 = 420,
    21/12 = 21 × 35/12 × 35 = 735/420
  3. Likewise, for the 2nd fraction, since 70 × 6 = 420,
    45/70 = 45 × 6/70 × 6 = 270/420
  4. Subtract the two like fractions:
    735/420 - 270/420 = 735 - 270/420 = 465/420
  5. After reducing the fraction, the answer is 31/28
  6. In mixed form: 13/28

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