521040 ÷ 39 
We want to divide 521040 by 39.

On to step 1:
When dividing 5 by 39, we get 0 with a remainder of 5.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 5, we get 5.
Fetch the next digit (2) from the dividend, attach it to 5 and continue: 52 / 39

Step 2:
52 divided by 39 is 1 with a remainder of 13.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Subtract 39 from 52 to get 13.
Append the next digit (1) from the dividend to 13 and continue with: 131 / 39

Going ahead to step 3:
The number 39 fits into 131 3 times, leaving a remainder of 14.
Write down 3 as next digit of the result. 
Result so far: 13.0
Subtract 117 from 131 to get 14.
Bring next digit (0) of the dividend behind the 14 and repeat the process: 140 / 39

Moving on to step 4:
39 goes into 140 3 times with a remainder of 23.
Put 3 as the next digit of the answer. 
Result so far: 133.0
If we take 117 away from 140, we end up with 23.
Append the next digit (4) from the dividend to 23 and continue with: 234 / 39

Let's proceed to step 5:
234 divided by 39 is 6 with a remainder of 0.
The next digit of our result is 6. 
Result so far: 1336.0
If we take 234 away from 234, we end up with 0.
Grab the next digit (0) from the dividend, add it to 0, then carry on: 0 / 39

Step 6:
When dividing 0 by 39, we get 0 with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 13360.0
Deduct 0 from 0 and we're left 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.

Let's proceed to step 7:
0 divided by 39 is 0 with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 13360.0
Deduct 0 from 0 and we're left 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 8:
0 divided by 39 is 0 with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 13360.0
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Our division results in 13360.0 with a remaining 0.0.