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Subtract 20/45 from 10/21

10/21 - 20/45 is 2/63.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 45 is 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,
    20/45 = 20 × 7/45 × 7 = 140/315
  4. Subtract the two fractions:
    150/315 - 140/315 = 150 - 140/315 = 10/315
  5. After reducing the fraction, the answer is 2/63

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