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Subtract 20/8 from 2/21

1st number: 2/21, 2nd number: 2 4/8

2/21 - 20/8 is -101/42.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 8 is 168

    Next, find the equivalent fraction of both fractional numbers with denominator 168
  2. For the 1st fraction, since 21 × 8 = 168,
    2/21 = 2 × 8/21 × 8 = 16/168
  3. Likewise, for the 2nd fraction, since 8 × 21 = 168,
    20/8 = 20 × 21/8 × 21 = 420/168
  4. Subtract the two like fractions:
    16/168 - 420/168 = 16 - 420/168 = -404/168
  5. After reducing the fraction, the answer is -101/42

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