Let's divide 39509040 by 320
We're looking to find how many times 320 goes into 39509040.

Step 1:
3 divided by 320 is 0 with a remainder of 3.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 3, we end up with 3.
Include the next digit (9) from the dividend after 3, then repeat: 39 / 320

Let's proceed to step 2:
If we divide 39 by 320, we get 0 and a remainder of 39.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 39 to get 39.
Append the next digit (5) from the dividend to 39 and continue with: 395 / 320

Advancing to step 3:
The number 320 fits into 395 1 times, leaving a remainder of 75.
Put 1 as the next digit of the answer. 
Result so far: 1.0
If we subtract 320 from 395, we get 75.
Grab the next digit (0) from the dividend, add it to 75, then carry on: 750 / 320

On to step 4:
320 can be fit into 750 2 times, resulting in a remainder of 110.
The number 2 becomes the next digit in our result. 
Result so far: 12.0
Deduct 640 from 750 and we're left with 110.
Bring next digit (9) of the dividend behind the 110 and repeat the process: 1109 / 320

Advancing to step 5:
320 can be fit into 1109 3 times, resulting in a remainder of 149.
The next digit of our result is 3. 
Result so far: 123.0
Deduct 960 from 1109 and we're left with 149.
Include the next digit (0) from the dividend after 149, then repeat: 1490 / 320

Step 6:
320 goes into 1490 4 times with a remainder of 210.
The number 4 becomes the next digit in our result. 
Result so far: 1234.0
Subtract 1280 from 1490 to get 210.
Grab the next digit (4) from the dividend, add it to 210, then carry on: 2104 / 320

Advancing to step 7:
When dividing 2104 by 320, we get 6 with a remainder of 184.
The next digit of our result is 6. 
Result so far: 12346.0
The remainder is 184 after subtracting 1920 from 2104.
Grab the next digit (0) from the dividend, add it to 184, then carry on: 1840 / 320

On to step 8:
1840 divided by 320 is 5 with a remainder of 240.
The next digit of our result is 5. 
Result so far: 123465.0
Subtract 1600 from 1840 to get 240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2400, and continue the process.

Step 9:
When dividing 2400 by 320, we get 7 with a remainder of 160.
Put 7 as the next digit of the answer. 
Result so far: 123465.7
Subtract 2240 from 2400 to get 160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1600, and continue the process.

Advancing to step 10:
If we divide 1600 by 320, we get 5 and a remainder of 0.
Record the quotient 5 as the next digit in the result. 
Result so far: 123465.75
The remainder is 0 after subtracting 1600 from 1600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Moving on to step 11:
The number 320 fits into 0 0 times, leaving a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 123465.75
Subtracting 0 from 0 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Step 12:
If we divide 0 by 320, we get 0 and a remainder of 0.
The next digit of our result is 0. 
Result so far: 123465.75
Subtract 0 from 0 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The quotient of the division is 123465.75, and the remainder is 0.0.