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Subtract 7/9 from 40/21

1st number: 1 19/21, 2nd number: 7/9

40/21 - 7/9 is 71/63.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 9 is 63

    Next, find the equivalent fraction of both fractional numbers with denominator 63
  2. For the 1st fraction, since 21 × 3 = 63,
    40/21 = 40 × 3/21 × 3 = 120/63
  3. Likewise, for the 2nd fraction, since 9 × 7 = 63,
    7/9 = 7 × 7/9 × 7 = 49/63
  4. Subtract the two like fractions:
    120/63 - 49/63 = 120 - 49/63 = 71/63
  5. In mixed form: 18/63

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