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Subtract 40/49 from 10/21

10/21 - 40/49 is -50/147.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 49 is 147
  2. For the 1st fraction, since 21 × 7 = 147,
    10/21 = 10 × 7/21 × 7 = 70/147
  3. Likewise, for the 2nd fraction, since 49 × 3 = 147,
    40/49 = 40 × 3/49 × 3 = 120/147
  4. Subtract the two fractions:
    70/147 - 120/147 = 70 - 120/147 = -50/147

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