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Subtract 15/40 from 90/7

1st number: 12 6/7, 2nd number: 15/40

90/7 - 15/40 is 699/56.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 7 and 40 is 280

    Next, find the equivalent fraction of both fractional numbers with denominator 280
  2. For the 1st fraction, since 7 × 40 = 280,
    90/7 = 90 × 40/7 × 40 = 3600/280
  3. Likewise, for the 2nd fraction, since 40 × 7 = 280,
    15/40 = 15 × 7/40 × 7 = 105/280
  4. Subtract the two like fractions:
    3600/280 - 105/280 = 3600 - 105/280 = 3495/280
  5. After reducing the fraction, the answer is 699/56
  6. In mixed form: 1227/56

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