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Subtract 18/4 from 42/10

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

42/10 - 18/4 is -3/10.

Steps for subtracting fractions

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

    Next, find the equivalent fraction of both fractional numbers with denominator 20
  2. For the 1st fraction, since 10 × 2 = 20,
    42/10 = 42 × 2/10 × 2 = 84/20
  3. Likewise, for the 2nd fraction, since 4 × 5 = 20,
    18/4 = 18 × 5/4 × 5 = 90/20
  4. Subtract the two like fractions:
    84/20 - 90/20 = 84 - 90/20 = -6/20
  5. After reducing the fraction, the answer is -3/10

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