3355710 divided by 399 
Our goal is to divide 3355710 by 399.

Advancing to step 1:
399 can be fit into 3 0 times, resulting in a remainder of 3.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 3 leaves us with 3.
Include the next digit (3) from the dividend after 3, then repeat: 33 / 399

Let's proceed to step 2:
The number 399 fits into 33 0 times, leaving a remainder of 33.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 33, we end up with 33.
Bring next digit (5) of the dividend behind the 33 and repeat the process: 335 / 399

Moving on to step 3:
335 divided by 399 is 0 with a remainder of 335.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 335 to get 335.
Grab the next digit (5) from the dividend, add it to 335, then carry on: 3355 / 399

On to step 4:
The number 399 fits into 3355 8 times, leaving a remainder of 163.
The next digit of our result is 8. 
Result so far: 8.0
Subtract 3192 from 3355 to get 163.
Bring next digit (7) of the dividend behind the 163 and repeat the process: 1637 / 399

On to step 5:
399 can be fit into 1637 4 times, resulting in a remainder of 41.
Record the quotient 4 as the next digit in the result. 
Result so far: 84.0
If we take 1596 away from 1637, we end up with 41.
Bring next digit (1) of the dividend behind the 41 and repeat the process: 411 / 399

Let's proceed to step 6:
399 can be fit into 411 1 times, resulting in a remainder of 12.
Put 1 as the next digit of the answer. 
Result so far: 841.0
Deduct 399 from 411 and we're left with 12.
Include the next digit (0) from the dividend after 12, then repeat: 120 / 399

Moving on to step 7:
The number 399 fits into 120 0 times, leaving a remainder of 120.
The next digit of our result is 0. 
Result so far: 8410.0
Subtracting 0 from 120 leaves us with 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1200, and continue the process.

Let's proceed to step 8:
The number 399 fits into 1200 3 times, leaving a remainder of 3.
The next digit of our result is 3. 
Result so far: 8410.3
Subtracting 1197 from 1200 leaves us with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

On to step 9:
When dividing 30 by 399, we get 0 with a remainder of 30.
Record the quotient 0 as the next digit in the result. 
Result so far: 8410.3
If we take 0 away from 30, we end up with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

On to step 10:
399 goes into 300 0 times with a remainder of 300.
Use 0 as the next digit of our solution. 
Result so far: 8410.3
If we subtract 0 from 300, we get 300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3000, and continue the process.

The final outcome is 8410.3, with a leftover of 0.03.