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Subtract 20/7 from 1/90

1st number: 1/90, 2nd number: 2 6/7

1/90 - 20/7 is -1793/630.

Steps for subtracting fractions

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

    Next, find the equivalent fraction of both fractional numbers with denominator 630
  2. For the 1st fraction, since 90 × 7 = 630,
    1/90 = 1 × 7/90 × 7 = 7/630
  3. Likewise, for the 2nd fraction, since 7 × 90 = 630,
    20/7 = 20 × 90/7 × 90 = 1800/630
  4. Subtract the two like fractions:
    7/630 - 1800/630 = 7 - 1800/630 = -1793/630

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