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Subtract 21/45 from 30/42

30/42 - 21/45 is 26/105.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 45 is 630
  2. For the 1st fraction, since 42 × 15 = 630,
    30/42 = 30 × 15/42 × 15 = 450/630
  3. Likewise, for the 2nd fraction, since 45 × 14 = 630,
    21/45 = 21 × 14/45 × 14 = 294/630
  4. Subtract the two fractions:
    450/630 - 294/630 = 450 - 294/630 = 156/630
  5. After reducing the fraction, the answer is 26/105

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