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Subtract 1/40 from 25/21

1st number: 1 4/21, 2nd number: 1/40

25/21 - 1/40 is 979/840.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 40 is 840

    Next, find the equivalent fraction of both fractional numbers with denominator 840
  2. For the 1st fraction, since 21 × 40 = 840,
    25/21 = 25 × 40/21 × 40 = 1000/840
  3. Likewise, for the 2nd fraction, since 40 × 21 = 840,
    1/40 = 1 × 21/40 × 21 = 21/840
  4. Subtract the two like fractions:
    1000/840 - 21/840 = 1000 - 21/840 = 979/840
  5. In mixed form: 1139/840

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