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Subtract 40/35 from 30/21

1st number: 1 9/21, 2nd number: 1 5/35

30/21 - 40/35 is 2/7.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 35 is 105
  2. For the 1st fraction, since 21 × 5 = 105,
    30/21 = 30 × 5/21 × 5 = 150/105
  3. Likewise, for the 2nd fraction, since 35 × 3 = 105,
    40/35 = 40 × 3/35 × 3 = 120/105
  4. Subtract the two fractions:
    150/105 - 120/105 = 150 - 120/105 = 30/105
  5. After reducing the fraction, the answer is 2/7

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