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Subtract 15/70 from 10/21

10/21 - 15/70 is 11/42.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 70 is 210
  2. For the 1st fraction, since 21 × 10 = 210,
    10/21 = 10 × 10/21 × 10 = 100/210
  3. Likewise, for the 2nd fraction, since 70 × 3 = 210,
    15/70 = 15 × 3/70 × 3 = 45/210
  4. Subtract the two fractions:
    100/210 - 45/210 = 100 - 45/210 = 55/210
  5. After reducing the fraction, the answer is 11/42

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