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Subtract 21/45 from 10/21

10/21 - 21/45 is 1/105.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 45 is 315

    Next, find the equivalent fraction of both fractional numbers with denominator 315
  2. For the 1st fraction, since 21 × 15 = 315,
    10/21 = 10 × 15/21 × 15 = 150/315
  3. Likewise, for the 2nd fraction, since 45 × 7 = 315,
    21/45 = 21 × 7/45 × 7 = 147/315
  4. Subtract the two like fractions:
    150/315 - 147/315 = 150 - 147/315 = 3/315
  5. After reducing the fraction, the answer is 1/105

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