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Subtract 1/90 from 42/21

1st number: 2 0/21, 2nd number: 1/90

42/21 - 1/90 is 179/90.

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,
    42/21 = 42 × 30/21 × 30 = 1260/630
  3. Likewise, for the 2nd fraction, since 90 × 7 = 630,
    1/90 = 1 × 7/90 × 7 = 7/630
  4. Subtract the two like fractions:
    1260/630 - 7/630 = 1260 - 7/630 = 1253/630
  5. After reducing the fraction, the answer is 179/90
  6. In mixed form: 189/90

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