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Subtract 7/90 from 7/21

7/21 - 7/90 is 23/90.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 90 is 630

    Next, find the equivalent fraction of both fractional numbers with denominator 630
  2. For the 1st fraction, since 21 × 30 = 630,
    7/21 = 7 × 30/21 × 30 = 210/630
  3. Likewise, for the 2nd fraction, since 90 × 7 = 630,
    7/90 = 7 × 7/90 × 7 = 49/630
  4. Subtract the two like fractions:
    210/630 - 49/630 = 210 - 49/630 = 161/630
  5. After reducing the fraction, the answer is 23/90

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