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Subtract 98/80 from 90/70

1st number: 1 20/70, 2nd number: 1 18/80

90/70 - 98/80 is 17/280.

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,
    90/70 = 90 × 8/70 × 8 = 720/560
  3. Likewise, for the 2nd fraction, since 80 × 7 = 560,
    98/80 = 98 × 7/80 × 7 = 686/560
  4. Subtract the two like fractions:
    720/560 - 686/560 = 720 - 686/560 = 34/560
  5. After reducing the fraction, the answer is 17/280

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