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Subtract 40/42 from 30/10

1st number: 3 0/10, 2nd number: 40/42

30/10 - 40/42 is 43/21.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 10 and 42 is 210

    Next, find the equivalent fraction of both fractional numbers with denominator 210
  2. For the 1st fraction, since 10 × 21 = 210,
    30/10 = 30 × 21/10 × 21 = 630/210
  3. Likewise, for the 2nd fraction, since 42 × 5 = 210,
    40/42 = 40 × 5/42 × 5 = 200/210
  4. Subtract the two like fractions:
    630/210 - 200/210 = 630 - 200/210 = 430/210
  5. After reducing the fraction, the answer is 43/21
  6. In mixed form: 21/21

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