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Subtract 21/5 from 12/10

1st number: 1 2/10, 2nd number: 4 1/5

12/10 - 21/5 is -3/1.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 10 and 5 is 10

    Next, find the equivalent fraction of both fractional numbers with denominator 10
  2. For the 1st fraction, since 10 × 1 = 10,
    12/10 = 12 × 1/10 × 1 = 12/10
  3. Likewise, for the 2nd fraction, since 5 × 2 = 10,
    21/5 = 21 × 2/5 × 2 = 42/10
  4. Subtract the two like fractions:
    12/10 - 42/10 = 12 - 42/10 = -30/10
  5. After reducing the fraction, the answer is -3/1

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