We look at the division of 420520 by 39 
We want to figure out the number of times 420520 can be divided by 39.

On to step 1:
39 goes into 4 0 times with a remainder of 4.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 4 to get 4.
Include the next digit (2) from the dividend after 4, then repeat: 42 / 39

Let's proceed to step 2:
The number 39 fits into 42 1 times, leaving a remainder of 3.
Use 1 as the next digit of our solution. 
Result so far: 1.0
If we subtract 39 from 42, we get 3.
Include the next digit (0) from the dividend after 3, then repeat: 30 / 39

Advancing to step 3:
If we divide 30 by 39, we get 0 and a remainder of 30.
Put 0 as the next digit of the answer. 
Result so far: 10.0
If we subtract 0 from 30, we get 30.
Take the next digit (5) from the dividend and append it to 30, then repeat: 305 / 39

Advancing to step 4:
39 can be fit into 305 7 times, resulting in a remainder of 32.
The next digit of our result is 7. 
Result so far: 107.0
Subtracting 273 from 305 leaves us with 32.
Fetch the next digit (2) from the dividend, attach it to 32 and continue: 322 / 39

Advancing to step 5:
322 divided by 39 is 8 with a remainder of 10.
Write down 8 as next digit of the result. 
Result so far: 1078.0
Deduct 312 from 322 and we're left with 10.
Include the next digit (0) from the dividend after 10, then repeat: 100 / 39

Advancing to step 6:
When dividing 100 by 39, we get 2 with a remainder of 22.
The next digit of our result is 2. 
Result so far: 10782.0
The remainder is 22 after subtracting 78 from 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

Advancing to step 7:
39 goes into 220 5 times with a remainder of 25.
Write down 5 as next digit of the result. 
Result so far: 10782.5
Subtracting 195 from 220 leaves us with 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

On to step 8:
If we divide 250 by 39, we get 6 and a remainder of 16.
Use 6 as the next digit of our solution. 
Result so far: 10782.56
If we take 234 away from 250, we end up with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Moving on to step 9:
160 divided by 39 is 4 with a remainder of 4.
Put 4 as the next digit of the answer. 
Result so far: 10782.564
Deduct 156 from 160 and we're left with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Step 10:
When dividing 40 by 39, we get 1 with a remainder of 1.
Use 1 as the next digit of our solution. 
Result so far: 10782.5641
Deduct 39 from 40 and we're left with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Moving on to step 11:
39 goes into 10 0 times with a remainder of 10.
Record the quotient 0 as the next digit in the result. 
Result so far: 10782.5641
The remainder is 10 after subtracting 0 from 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Moving on to step 12:
The number 39 fits into 100 2 times, leaving a remainder of 22.
The number 2 becomes the next digit in our result. 
Result so far: 10782.564102
Subtract 78 from 100 to get 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

Step 13:
39 goes into 220 5 times with a remainder of 25.
Write down 5 as next digit of the result. 
Result so far: 10782.5641025
Subtract 195 from 220 to get 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

Step 14:
39 goes into 250 6 times with a remainder of 16.
Write down 6 as next digit of the result. 
Result so far: 10782.56410256
Subtract 234 from 250 to get 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

After the division, we end up with 10782.56410256 and a remainder of 1.6e-08.