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Subtract 42/80 from 7/70

7/70 - 42/80 is -17/40.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 70 and 80 is 560

    Next, find the equivalent fraction of both fractional numbers with denominator 560
  2. For the 1st fraction, since 70 × 8 = 560,
    7/70 = 7 × 8/70 × 8 = 56/560
  3. Likewise, for the 2nd fraction, since 80 × 7 = 560,
    42/80 = 42 × 7/80 × 7 = 294/560
  4. Subtract the two like fractions:
    56/560 - 294/560 = 56 - 294/560 = -238/560
  5. After reducing the fraction, the answer is -17/40

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