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Subtract 4/90 from 5/21

5/21 - 4/90 is 61/315.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 90 is 630
  2. For the 1st fraction, since 21 × 30 = 630,
    5/21 = 5 × 30/21 × 30 = 150/630
  3. Likewise, for the 2nd fraction, since 90 × 7 = 630,
    4/90 = 4 × 7/90 × 7 = 28/630
  4. Subtract the two fractions:
    150/630 - 28/630 = 150 - 28/630 = 122/630
  5. After reducing the fraction, the answer is 61/315

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