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Subtract 1/21 from 7/5

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

7/5 - 1/21 is 142/105.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 5 and 21 is 105

    Next, find the equivalent fraction of both fractional numbers with denominator 105
  2. For the 1st fraction, since 5 × 21 = 105,
    7/5 = 7 × 21/5 × 21 = 147/105
  3. Likewise, for the 2nd fraction, since 21 × 5 = 105,
    1/21 = 1 × 5/21 × 5 = 5/105
  4. Subtract the two like fractions:
    147/105 - 5/105 = 147 - 5/105 = 142/105
  5. In mixed form: 137/105

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