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Subtract 10/5 from 7/21

1st number: 7/21, 2nd number: 2 0/5

7/21 - 10/5 is -5/3.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 5 is 105
  2. For the 1st fraction, since 21 × 5 = 105,
    7/21 = 7 × 5/21 × 5 = 35/105
  3. Likewise, for the 2nd fraction, since 5 × 21 = 105,
    10/5 = 10 × 21/5 × 21 = 210/105
  4. Subtract the two fractions:
    35/105 - 210/105 = 35 - 210/105 = -175/105
  5. After reducing the fraction, the answer is -5/3

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