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Subtract 8/21 from 8/30

8/30 - 8/21 is -4/35.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 30 and 21 is 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 21 × 10 = 210,
    8/21 = 8 × 10/21 × 10 = 80/210
  4. Subtract the two fractions:
    56/210 - 80/210 = 56 - 80/210 = -24/210
  5. After reducing the fraction, the answer is -4/35

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