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Subtract 10/7 from 90/70

1st number: 1 20/70, 2nd number: 1 3/7

90/70 - 10/7 is -1/7.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 70 and 7 is 70

    Next, find the equivalent fraction of both fractional numbers with denominator 70
  2. For the 1st fraction, since 70 × 1 = 70,
    90/70 = 90 × 1/70 × 1 = 90/70
  3. Likewise, for the 2nd fraction, since 7 × 10 = 70,
    10/7 = 10 × 10/7 × 10 = 100/70
  4. Subtract the two like fractions:
    90/70 - 100/70 = 90 - 100/70 = -10/70
  5. After reducing the fraction, the answer is -1/7

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