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Subtract 40/21 from 8/30

1st number: 8/30, 2nd number: 1 19/21

8/30 - 40/21 is -172/105.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 30 and 21 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 21 × 10 = 210,
    40/21 = 40 × 10/21 × 10 = 400/210
  4. Subtract the two like fractions:
    56/210 - 400/210 = 56 - 400/210 = -344/210
  5. After reducing the fraction, the answer is -172/105

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