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Subtract 2/7 from 21/90

21/90 - 2/7 is -11/210.

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,
    21/90 = 21 × 7/90 × 7 = 147/630
  3. Likewise, for the 2nd fraction, since 7 × 90 = 630,
    2/7 = 2 × 90/7 × 90 = 180/630
  4. Subtract the two like fractions:
    147/630 - 180/630 = 147 - 180/630 = -33/630
  5. After reducing the fraction, the answer is -11/210

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