43905179 ÷ 521 
Our goal is to divide 43905179 by 521.

On to step 1:
521 can be fit into 4 0 times, resulting in a remainder of 4.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 4 and we're left with 4.
Grab the next digit (3) from the dividend, add it to 4, then carry on: 43 / 521

On to step 2:
If we divide 43 by 521, we get 0 and a remainder of 43.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 43 to get 43.
Bring next digit (9) of the dividend behind the 43 and repeat the process: 439 / 521

Moving on to step 3:
When dividing 439 by 521, we get 0 with a remainder of 439.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 439, we end up with 439.
Fetch the next digit (0) from the dividend, attach it to 439 and continue: 4390 / 521

On to step 4:
The number 521 fits into 4390 8 times, leaving a remainder of 222.
Put 8 as the next digit of the answer. 
Result so far: 8.0
The remainder is 222 after subtracting 4168 from 4390.
Include the next digit (5) from the dividend after 222, then repeat: 2225 / 521

Step 5:
The number 521 fits into 2225 4 times, leaving a remainder of 141.
The next digit of our result is 4. 
Result so far: 84.0
If we take 2084 away from 2225, we end up with 141.
Fetch the next digit (1) from the dividend, attach it to 141 and continue: 1411 / 521

Step 6:
1411 divided by 521 is 2 with a remainder of 369.
Record the quotient 2 as the next digit in the result. 
Result so far: 842.0
Subtract 1042 from 1411 to get 369.
Grab the next digit (7) from the dividend, add it to 369, then carry on: 3697 / 521

Going ahead to step 7:
When dividing 3697 by 521, we get 7 with a remainder of 50.
Record the quotient 7 as the next digit in the result. 
Result so far: 8427.0
The remainder is 50 after subtracting 3647 from 3697.
Bring next digit (9) of the dividend behind the 50 and repeat the process: 509 / 521

Step 8:
If we divide 509 by 521, we get 0 and a remainder of 509.
The next digit of our result is 0. 
Result so far: 84270.0
If we take 0 away from 509, we end up with 509.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5090, and continue the process.

Going ahead to step 9:
The number 521 fits into 5090 9 times, leaving a remainder of 401.
Use 9 as the next digit of our solution. 
Result so far: 84270.9
Subtract 4689 from 5090 to get 401.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4010, and continue the process.

Going ahead to step 10:
4010 divided by 521 is 7 with a remainder of 363.
Put 7 as the next digit of the answer. 
Result so far: 84270.97
The remainder is 363 after subtracting 3647 from 4010.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3630, and continue the process.

Advancing to step 11:
521 goes into 3630 6 times with a remainder of 504.
Put 6 as the next digit of the answer. 
Result so far: 84270.976
Deduct 3126 from 3630 and we're left with 504.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5040, and continue the process.

Step 12:
When dividing 5040 by 521, we get 9 with a remainder of 351.
Record the quotient 9 as the next digit in the result. 
Result so far: 84270.9769
If we subtract 4689 from 5040, we get 351.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3510, and continue the process.

Advancing to step 13:
When dividing 3510 by 521, we get 6 with a remainder of 384.
Write down 6 as next digit of the result. 
Result so far: 84270.97696
Subtract 3126 from 3510 to get 384.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3840, and continue the process.

Advancing to step 14:
521 can be fit into 3840 7 times, resulting in a remainder of 193.
Put 7 as the next digit of the answer. 
Result so far: 84270.976967
If we subtract 3647 from 3840, we get 193.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1930, and continue the process.

Advancing to step 15:
521 can be fit into 1930 3 times, resulting in a remainder of 367.
The number 3 becomes the next digit in our result. 
Result so far: 84270.9769673
Deduct 1563 from 1930 and we're left with 367.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3670, and continue the process.

On to step 16:
If we divide 3670 by 521, we get 7 and a remainder of 23.
The number 7 becomes the next digit in our result. 
Result so far: 84270.97696737
Deduct 3647 from 3670 and we're left with 23.
Since there are no more digits in the dividend, we add a zero to the remainder making it 230, and continue the process.

In conclusion, the division gives 84270.97696737 with a balance of 2.3e-08.