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Subtract 1/21 from 7/4

1st number: 1 3/4, 2nd number: 1/21

7/4 - 1/21 is 143/84.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 4 and 21 is 84
  2. For the 1st fraction, since 4 × 21 = 84,
    7/4 = 7 × 21/4 × 21 = 147/84
  3. Likewise, for the 2nd fraction, since 21 × 4 = 84,
    1/21 = 1 × 4/21 × 4 = 4/84
  4. Subtract the two fractions:
    147/84 - 4/84 = 147 - 4/84 = 143/84
  5. In mixed form: 159/84

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