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Subtract 10/21 from 7/30

7/30 - 10/21 is -17/70.

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,
    7/30 = 7 × 7/30 × 7 = 49/210
  3. Likewise, for the 2nd fraction, since 21 × 10 = 210,
    10/21 = 10 × 10/21 × 10 = 100/210
  4. Subtract the two like fractions:
    49/210 - 100/210 = 49 - 100/210 = -51/210
  5. After reducing the fraction, the answer is -17/70

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