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Subtract 1/21 from 42/90

42/90 - 1/21 is 44/105.

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,
    42/90 = 42 × 7/90 × 7 = 294/630
  3. Likewise, for the 2nd fraction, since 21 × 30 = 630,
    1/21 = 1 × 30/21 × 30 = 30/630
  4. Subtract the two like fractions:
    294/630 - 30/630 = 294 - 30/630 = 264/630
  5. After reducing the fraction, the answer is 44/105

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