43617874 ÷ 521 
We want to figure out the number of times 43617874 can be divided by 521.

Advancing to step 1:
If we divide 4 by 521, we get 0 and a remainder of 4.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 4 after subtracting 0 from 4.
Include the next digit (3) from the dividend after 4, then repeat: 43 / 521

Advancing to step 2:
43 divided by 521 is 0 with a remainder of 43.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 43, we get 43.
Take the next digit (6) from the dividend and append it to 43, then repeat: 436 / 521

Going ahead to step 3:
521 goes into 436 0 times with a remainder of 436.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 436 and we're left with 436.
Fetch the next digit (1) from the dividend, attach it to 436 and continue: 4361 / 521

Step 4:
521 can be fit into 4361 8 times, resulting in a remainder of 193.
Write down 8 as next digit of the result. 
Result so far: 8.0
Deduct 4168 from 4361 and we're left with 193.
Fetch the next digit (7) from the dividend, attach it to 193 and continue: 1937 / 521

Advancing to step 5:
521 can be fit into 1937 3 times, resulting in a remainder of 374.
Write down 3 as next digit of the result. 
Result so far: 83.0
Deduct 1563 from 1937 and we're left with 374.
Fetch the next digit (8) from the dividend, attach it to 374 and continue: 3748 / 521

Advancing to step 6:
The number 521 fits into 3748 7 times, leaving a remainder of 101.
Use 7 as the next digit of our solution. 
Result so far: 837.0
If we take 3647 away from 3748, we end up with 101.
Fetch the next digit (7) from the dividend, attach it to 101 and continue: 1017 / 521

Advancing to step 7:
521 goes into 1017 1 times with a remainder of 496.
The next digit of our result is 1. 
Result so far: 8371.0
The remainder is 496 after subtracting 521 from 1017.
Fetch the next digit (4) from the dividend, attach it to 496 and continue: 4964 / 521

Moving on to step 8:
521 can be fit into 4964 9 times, resulting in a remainder of 275.
Put 9 as the next digit of the answer. 
Result so far: 83719.0
If we subtract 4689 from 4964, we get 275.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2750, and continue the process.

Going ahead to step 9:
When dividing 2750 by 521, we get 5 with a remainder of 145.
Put 5 as the next digit of the answer. 
Result so far: 83719.5
If we take 2605 away from 2750, we end up with 145.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1450, and continue the process.

Going ahead to step 10:
When dividing 1450 by 521, we get 2 with a remainder of 408.
The next digit of our result is 2. 
Result so far: 83719.52
Subtracting 1042 from 1450 leaves us with 408.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4080, and continue the process.

On to step 11:
521 can be fit into 4080 7 times, resulting in a remainder of 433.
The next digit of our result is 7. 
Result so far: 83719.527
Deduct 3647 from 4080 and we're left with 433.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4330, and continue the process.

Step 12:
4330 divided by 521 is 8 with a remainder of 162.
The next digit of our result is 8. 
Result so far: 83719.5278
If we take 4168 away from 4330, we end up with 162.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1620, and continue the process.

Moving on to step 13:
1620 divided by 521 is 3 with a remainder of 57.
Put 3 as the next digit of the answer. 
Result so far: 83719.52783
The remainder is 57 after subtracting 1563 from 1620.
Since there are no more digits in the dividend, we add a zero to the remainder making it 570, and continue the process.

Advancing to step 14:
521 goes into 570 1 times with a remainder of 49.
Write down 1 as next digit of the result. 
Result so far: 83719.527831
Deduct 521 from 570 and we're left with 49.
Since there are no more digits in the dividend, we add a zero to the remainder making it 490, and continue the process.

Going ahead to step 15:
The number 521 fits into 490 0 times, leaving a remainder of 490.
Write down 0 as next digit of the result. 
Result so far: 83719.527831
If we subtract 0 from 490, we get 490.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4900, and continue the process.

Let's proceed to step 16:
When dividing 4900 by 521, we get 9 with a remainder of 211.
The next digit of our result is 9. 
Result so far: 83719.52783109
If we take 4689 away from 4900, we end up with 211.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2110, and continue the process.

After the division, we end up with 83719.52783109 and a remainder of 2.11e-07.