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Subtract 81/21 from 4/10

1st number: 4/10, 2nd number: 3 18/21

4/10 - 81/21 is -121/35.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 10 and 21 is 210

    Next, find the equivalent fraction of both fractional numbers with denominator 210
  2. For the 1st fraction, since 10 × 21 = 210,
    4/10 = 4 × 21/10 × 21 = 84/210
  3. Likewise, for the 2nd fraction, since 21 × 10 = 210,
    81/21 = 81 × 10/21 × 10 = 810/210
  4. Subtract the two like fractions:
    84/210 - 810/210 = 84 - 810/210 = -726/210
  5. After reducing the fraction, the answer is -121/35

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