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Subtract 8/30 from 5/21

5/21 - 8/30 is -1/35.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 30 is 210

    Next, find the equivalent fraction of both fractional numbers with denominator 210
  2. For the 1st fraction, since 21 × 10 = 210,
    5/21 = 5 × 10/21 × 10 = 50/210
  3. Likewise, for the 2nd fraction, since 30 × 7 = 210,
    8/30 = 8 × 7/30 × 7 = 56/210
  4. Subtract the two like fractions:
    50/210 - 56/210 = 50 - 56/210 = -6/210
  5. After reducing the fraction, the answer is -1/35

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