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Subtract 72/70 from 63/90

1st number: 63/90, 2nd number: 1 2/70

63/90 - 72/70 is -23/70.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 90 and 70 is 630
  2. For the 1st fraction, since 90 × 7 = 630,
    63/90 = 63 × 7/90 × 7 = 441/630
  3. Likewise, for the 2nd fraction, since 70 × 9 = 630,
    72/70 = 72 × 9/70 × 9 = 648/630
  4. Subtract the two fractions:
    441/630 - 648/630 = 441 - 648/630 = -207/630
  5. After reducing the fraction, the answer is -23/70

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