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Subtract 1/42 from 21/90

21/90 - 1/42 is 22/105.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 90 and 42 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 42 × 15 = 630,
    1/42 = 1 × 15/42 × 15 = 15/630
  4. Subtract the two like fractions:
    147/630 - 15/630 = 147 - 15/630 = 132/630
  5. After reducing the fraction, the answer is 22/105

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