643630 divided by 43 
We want to figure out the number of times 643630 can be divided by 43.

Step 1:
6 divided by 43 is 0 with a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Bring next digit (4) of the dividend behind the 6 and repeat the process: 64 / 43

Advancing to step 2:
When dividing 64 by 43, we get 1 with a remainder of 21.
The next digit of our result is 1. 
Result so far: 1.0
Subtracting 43 from 64 leaves us with 21.
Fetch the next digit (3) from the dividend, attach it to 21 and continue: 213 / 43

On to step 3:
If we divide 213 by 43, we get 4 and a remainder of 41.
Put 4 as the next digit of the answer. 
Result so far: 14.0
If we take 172 away from 213, we end up with 41.
Append the next digit (6) from the dividend to 41 and continue with: 416 / 43

Moving on to step 4:
43 goes into 416 9 times with a remainder of 29.
Record the quotient 9 as the next digit in the result. 
Result so far: 149.0
If we take 387 away from 416, we end up with 29.
Include the next digit (3) from the dividend after 29, then repeat: 293 / 43

Step 5:
43 goes into 293 6 times with a remainder of 35.
Write down 6 as next digit of the result. 
Result so far: 1496.0
The remainder is 35 after subtracting 258 from 293.
Take the next digit (0) from the dividend and append it to 35, then repeat: 350 / 43

Advancing to step 6:
43 can be fit into 350 8 times, resulting in a remainder of 6.
The number 8 becomes the next digit in our result. 
Result so far: 14968.0
The remainder is 6 after subtracting 344 from 350.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Advancing to step 7:
43 can be fit into 60 1 times, resulting in a remainder of 17.
Record the quotient 1 as the next digit in the result. 
Result so far: 14968.1
The remainder is 17 after subtracting 43 from 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Step 8:
The number 43 fits into 170 3 times, leaving a remainder of 41.
The next digit of our result is 3. 
Result so far: 14968.13
Deduct 129 from 170 and we're left with 41.
Since there are no more digits in the dividend, we add a zero to the remainder making it 410, and continue the process.

On to step 9:
43 can be fit into 410 9 times, resulting in a remainder of 23.
Use 9 as the next digit of our solution. 
Result so far: 14968.139
If we take 387 away from 410, we end up 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.

Advancing to step 10:
The number 43 fits into 230 5 times, leaving a remainder of 15.
Use 5 as the next digit of our solution. 
Result so far: 14968.1395
Subtracting 215 from 230 leaves us with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Advancing to step 11:
When dividing 150 by 43, we get 3 with a remainder of 21.
The number 3 becomes the next digit in our result. 
Result so far: 14968.13953
Subtracting 129 from 150 leaves us with 21.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

Step 12:
If we divide 210 by 43, we get 4 and a remainder of 38.
Put 4 as the next digit of the answer. 
Result so far: 14968.139534
Deduct 172 from 210 and we're left with 38.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

On to step 13:
43 can be fit into 380 8 times, resulting in a remainder of 36.
Record the quotient 8 as the next digit in the result. 
Result so far: 14968.1395348
Deduct 344 from 380 and we're left with 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

On to step 14:
43 can be fit into 360 8 times, resulting in a remainder of 16.
Record the quotient 8 as the next digit in the result. 
Result so far: 14968.13953488
Subtracting 344 from 360 leaves us 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.

The final result is 14968.13953488 with a remainder of 1.6e-08.