We're dividing 643438 by 99 
We're looking to find how many times 99 goes into 643438.

Going ahead to step 1:
99 can be fit into 6 0 times, resulting in a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 6 after subtracting 0 from 6.
Fetch the next digit (4) from the dividend, attach it to 6 and continue: 64 / 99

Step 2:
When dividing 64 by 99, we get 0 with a remainder of 64.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 64 after subtracting 0 from 64.
Grab the next digit (3) from the dividend, add it to 64, then carry on: 643 / 99

Moving on to step 3:
99 goes into 643 6 times with a remainder of 49.
Use 6 as the next digit of our solution. 
Result so far: 6.0
Deduct 594 from 643 and we're left with 49.
Bring next digit (4) of the dividend behind the 49 and repeat the process: 494 / 99

Advancing to step 4:
The number 99 fits into 494 4 times, leaving a remainder of 98.
Put 4 as the next digit of the answer. 
Result so far: 64.0
Subtract 396 from 494 to get 98.
Include the next digit (3) from the dividend after 98, then repeat: 983 / 99

Going ahead to step 5:
99 can be fit into 983 9 times, resulting in a remainder of 92.
Record the quotient 9 as the next digit in the result. 
Result so far: 649.0
Subtract 891 from 983 to get 92.
Grab the next digit (8) from the dividend, add it to 92, then carry on: 928 / 99

Moving on to step 6:
The number 99 fits into 928 9 times, leaving a remainder of 37.
Write down 9 as next digit of the result. 
Result so far: 6499.0
If we subtract 891 from 928, we get 37.
Since there are no more digits in the dividend, we add a zero to the remainder making it 370, and continue the process.

Going ahead to step 7:
99 can be fit into 370 3 times, resulting in a remainder of 73.
The next digit of our result is 3. 
Result so far: 6499.3
Deduct 297 from 370 and we're left with 73.
Since there are no more digits in the dividend, we add a zero to the remainder making it 730, and continue the process.

On to step 8:
When dividing 730 by 99, we get 7 with a remainder of 37.
The next digit of our result is 7. 
Result so far: 6499.37
Deduct 693 from 730 and we're left with 37.
Since there are no more digits in the dividend, we add a zero to the remainder making it 370, and continue the process.

Going ahead to step 9:
370 divided by 99 is 3 with a remainder of 73.
Use 3 as the next digit of our solution. 
Result so far: 6499.373
Deduct 297 from 370 and we're left with 73.
Since there are no more digits in the dividend, we add a zero to the remainder making it 730, and continue the process.

Advancing to step 10:
The number 99 fits into 730 7 times, leaving a remainder of 37.
The next digit of our result is 7. 
Result so far: 6499.3737
If we take 693 away from 730, we end up with 37.
Since there are no more digits in the dividend, we add a zero to the remainder making it 370, and continue the process.

Let's proceed to step 11:
When dividing 370 by 99, we get 3 with a remainder of 73.
Use 3 as the next digit of our solution. 
Result so far: 6499.37373
The remainder is 73 after subtracting 297 from 370.
Since there are no more digits in the dividend, we add a zero to the remainder making it 730, and continue the process.

Let's proceed to step 12:
When dividing 730 by 99, we get 7 with a remainder of 37.
Write down 7 as next digit of the result. 
Result so far: 6499.373737
Subtracting 693 from 730 leaves us with 37.
Since there are no more digits in the dividend, we add a zero to the remainder making it 370, and continue the process.

Going ahead to step 13:
370 divided by 99 is 3 with a remainder of 73.
Put 3 as the next digit of the answer. 
Result so far: 6499.3737373
If we subtract 297 from 370, we get 73.
Since there are no more digits in the dividend, we add a zero to the remainder making it 730, and continue the process.

On to step 14:
The number 99 fits into 730 7 times, leaving a remainder of 37.
Put 7 as the next digit of the answer. 
Result so far: 6499.37373737
Deduct 693 from 730 and we're left with 37.
Since there are no more digits in the dividend, we add a zero to the remainder making it 370, and continue the process.

The quotient of the division is 6499.37373737, and the remainder is 3.7e-08.