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Subtract 21/25 from 20/64

20/64 - 21/25 is -211/400.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 64 and 25 is 1600

    Next, find the equivalent fraction of both fractional numbers with denominator 1600
  2. For the 1st fraction, since 64 × 25 = 1600,
    20/64 = 20 × 25/64 × 25 = 500/1600
  3. Likewise, for the 2nd fraction, since 25 × 64 = 1600,
    21/25 = 21 × 64/25 × 64 = 1344/1600
  4. Subtract the two like fractions:
    500/1600 - 1344/1600 = 500 - 1344/1600 = -844/1600
  5. After reducing the fraction, the answer is -211/400

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