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Subtract 7/49 from 1/21

1/21 - 7/49 is -2/21.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 49 is 147

    Next, find the equivalent fraction of both fractional numbers with denominator 147
  2. For the 1st fraction, since 21 × 7 = 147,
    1/21 = 1 × 7/21 × 7 = 7/147
  3. Likewise, for the 2nd fraction, since 49 × 3 = 147,
    7/49 = 7 × 3/49 × 3 = 21/147
  4. Subtract the two like fractions:
    7/147 - 21/147 = 7 - 21/147 = -14/147
  5. After reducing the fraction, the answer is -2/21

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