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Subtract 21/10 from 2/4

1st number: 2/4, 2nd number: 2 1/10

2/4 - 21/10 is -8/5.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 4 and 10 is 20

    Next, find the equivalent fraction of both fractional numbers with denominator 20
  2. For the 1st fraction, since 4 × 5 = 20,
    2/4 = 2 × 5/4 × 5 = 10/20
  3. Likewise, for the 2nd fraction, since 10 × 2 = 20,
    21/10 = 21 × 2/10 × 2 = 42/20
  4. Subtract the two like fractions:
    10/20 - 42/20 = 10 - 42/20 = -32/20
  5. After reducing the fraction, the answer is -8/5

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