Let's divide 18686529 by 643
Our goal is to divide 18686529 by 643.

Advancing to step 1:
When dividing 1 by 643, we get 0 with a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 1 to get 1.
Include the next digit (8) from the dividend after 1, then repeat: 18 / 643

Moving on to step 2:
The number 643 fits into 18 0 times, leaving a remainder of 18.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 18, we get 18.
Take the next digit (6) from the dividend and append it to 18, then repeat: 186 / 643

Let's proceed to step 3:
When dividing 186 by 643, we get 0 with a remainder of 186.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 186 to get 186.
Bring next digit (8) of the dividend behind the 186 and repeat the process: 1868 / 643

Step 4:
The number 643 fits into 1868 2 times, leaving a remainder of 582.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
The remainder is 582 after subtracting 1286 from 1868.
Fetch the next digit (6) from the dividend, attach it to 582 and continue: 5826 / 643

Moving on to step 5:
643 can be fit into 5826 9 times, resulting in a remainder of 39.
Use 9 as the next digit of our solution. 
Result so far: 29.0
Subtracting 5787 from 5826 leaves us with 39.
Fetch the next digit (5) from the dividend, attach it to 39 and continue: 395 / 643

Let's proceed to step 6:
395 divided by 643 is 0 with a remainder of 395.
The number 0 becomes the next digit in our result. 
Result so far: 290.0
If we subtract 0 from 395, we get 395.
Take the next digit (2) from the dividend and append it to 395, then repeat: 3952 / 643

Step 7:
When dividing 3952 by 643, we get 6 with a remainder of 94.
The next digit of our result is 6. 
Result so far: 2906.0
If we subtract 3858 from 3952, we get 94.
Bring next digit (9) of the dividend behind the 94 and repeat the process: 949 / 643

Step 8:
949 divided by 643 is 1 with a remainder of 306.
The next digit of our result is 1. 
Result so far: 29061.0
Deduct 643 from 949 and we're left with 306.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3060, and continue the process.

Going ahead to step 9:
643 goes into 3060 4 times with a remainder of 488.
Record the quotient 4 as the next digit in the result. 
Result so far: 29061.4
Subtract 2572 from 3060 to get 488.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4880, and continue the process.

On to step 10:
643 can be fit into 4880 7 times, resulting in a remainder of 379.
The next digit of our result is 7. 
Result so far: 29061.47
Subtracting 4501 from 4880 leaves us with 379.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3790, and continue the process.

On to step 11:
The number 643 fits into 3790 5 times, leaving a remainder of 575.
Use 5 as the next digit of our solution. 
Result so far: 29061.475
The remainder is 575 after subtracting 3215 from 3790.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5750, and continue the process.

Moving on to step 12:
If we divide 5750 by 643, we get 8 and a remainder of 606.
Write down 8 as next digit of the result. 
Result so far: 29061.4758
If we take 5144 away from 5750, we end up with 606.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6060, and continue the process.

Moving on to step 13:
643 can be fit into 6060 9 times, resulting in a remainder of 273.
Put 9 as the next digit of the answer. 
Result so far: 29061.47589
If we subtract 5787 from 6060, we get 273.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2730, and continue the process.

Step 14:
If we divide 2730 by 643, we get 4 and a remainder of 158.
Use 4 as the next digit of our solution. 
Result so far: 29061.475894
If we subtract 2572 from 2730, we get 158.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1580, and continue the process.

Step 15:
If we divide 1580 by 643, we get 2 and a remainder of 294.
Use 2 as the next digit of our solution. 
Result so far: 29061.4758942
Subtracting 1286 from 1580 leaves us with 294.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2940, and continue the process.

On to step 16:
643 can be fit into 2940 4 times, resulting in a remainder of 368.
Record the quotient 4 as the next digit in the result. 
Result so far: 29061.47589424
Subtract 2572 from 2940 to get 368.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3680, and continue the process.

The final outcome is 29061.47589424, with a leftover of 3.68e-07.