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Subtract 21/42 from 8/30

8/30 - 21/42 is -7/30.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 30 and 42 is 210

    Next, find the equivalent fraction of both fractional numbers with denominator 210
  2. For the 1st fraction, since 30 × 7 = 210,
    8/30 = 8 × 7/30 × 7 = 56/210
  3. Likewise, for the 2nd fraction, since 42 × 5 = 210,
    21/42 = 21 × 5/42 × 5 = 105/210
  4. Subtract the two like fractions:
    56/210 - 105/210 = 56 - 105/210 = -49/210
  5. After reducing the fraction, the answer is -7/30

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