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Subtract 72/63 from 42/40

1st number: 1 2/40, 2nd number: 1 9/63

42/40 - 72/63 is -13/140.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 40 and 63 is 2520
  2. For the 1st fraction, since 40 × 63 = 2520,
    42/40 = 42 × 63/40 × 63 = 2646/2520
  3. Likewise, for the 2nd fraction, since 63 × 40 = 2520,
    72/63 = 72 × 40/63 × 40 = 2880/2520
  4. Subtract the two fractions:
    2646/2520 - 2880/2520 = 2646 - 2880/2520 = -234/2520
  5. After reducing the fraction, the answer is -13/140

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