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Subtract 8/90 from 15/7

1st number: 2 1/7, 2nd number: 8/90

15/7 - 8/90 is 647/315.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 7 and 90 is 630

    Next, find the equivalent fraction of both fractional numbers with denominator 630
  2. For the 1st fraction, since 7 × 90 = 630,
    15/7 = 15 × 90/7 × 90 = 1350/630
  3. Likewise, for the 2nd fraction, since 90 × 7 = 630,
    8/90 = 8 × 7/90 × 7 = 56/630
  4. Subtract the two like fractions:
    1350/630 - 56/630 = 1350 - 56/630 = 1294/630
  5. After reducing the fraction, the answer is 647/315
  6. In mixed form: 217/315

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