Long Division Problem: Divide 339 by 3 Step-by-Step

To solve the problem $39 \div 3$, we will apply long division:

• Step 1: Set up the division problem.
  Write 39 inside the division bracket and 3 outside as the divisor.
• Step 2: Divide the first digit of the dividend by the divisor.
  Determine how many times 3 fits into 3 (the first digit of 39):
  3 fits into 3 exactly 1 time. Write 1 above the line.
• Step 3: Multiply and subtract.
  Multiply 3 (divisor) by the result from the previous step (1), giving 3.
  Subtract 3 from 3, resulting in 0.
• Step 4: Bring down the next digit of the dividend.
  Bring down 9 (the next digit from 39). The new number to consider is 9.
• Step 5: Divide the result by the divisor.
  Determine how many times 3 fits into 9: 3 fits into 9 exactly 3 times. Write 3 above the line.
• Step 6: Multiply and subtract again.
  Multiply 3 by 3, which gives 9. Subtract 9 from 9, resulting in 0.

The division process is complete with no remainder. The quotient is 13.

The final answer is $\boxed{13}$.