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Subtract 35/20 from 21/84

1st number: 21/84, 2nd number: 1 15/20

21/84 - 35/20 is -3/2.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 84 and 20 is 420

    Next, find the equivalent fraction of both fractional numbers with denominator 420
  2. For the 1st fraction, since 84 × 5 = 420,
    21/84 = 21 × 5/84 × 5 = 105/420
  3. Likewise, for the 2nd fraction, since 20 × 21 = 420,
    35/20 = 35 × 21/20 × 21 = 735/420
  4. Subtract the two like fractions:
    105/420 - 735/420 = 105 - 735/420 = -630/420
  5. After reducing the fraction, the answer is -3/2

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