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Subtract 70/21 from 1/90

1st number: 1/90, 2nd number: 3 7/21

1/90 - 70/21 is -299/90.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 90 and 21 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 21 × 30 = 630,
    70/21 = 70 × 30/21 × 30 = 2100/630
  4. Subtract the two like fractions:
    7/630 - 2100/630 = 7 - 2100/630 = -2093/630
  5. After reducing the fraction, the answer is -299/90

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