We're dividing 64373389 by 643 
Our goal is to divide 64373389 by 643.

Moving on to step 1:
If we divide 6 by 643, we get 0 and a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Fetch the next digit (4) from the dividend, attach it to 6 and continue: 64 / 643

Let's proceed to step 2:
The number 643 fits into 64 0 times, leaving a remainder of 64.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 64 and we're left with 64.
Fetch the next digit (3) from the dividend, attach it to 64 and continue: 643 / 643

Step 3:
If we divide 643 by 643, we get 1 and a remainder of 0.
The next digit of our result is 1. 
Result so far: 1.0
Deduct 643 from 643 and we're left with 0.
Append the next digit (7) from the dividend to 0 and continue with: 7 / 643

Step 4:
7 divided by 643 is 0 with a remainder of 7.
Record the quotient 0 as the next digit in the result. 
Result so far: 10.0
Subtracting 0 from 7 leaves us with 7.
Take the next digit (3) from the dividend and append it to 7, then repeat: 73 / 643

Advancing to step 5:
73 divided by 643 is 0 with a remainder of 73.
Use 0 as the next digit of our solution. 
Result so far: 100.0
Deduct 0 from 73 and we're left with 73.
Include the next digit (3) from the dividend after 73, then repeat: 733 / 643

Step 6:
643 can be fit into 733 1 times, resulting in a remainder of 90.
Write down 1 as next digit of the result. 
Result so far: 1001.0
If we subtract 643 from 733, we get 90.
Grab the next digit (8) from the dividend, add it to 90, then carry on: 908 / 643

Step 7:
908 divided by 643 is 1 with a remainder of 265.
The next digit of our result is 1. 
Result so far: 10011.0
If we take 643 away from 908, we end up with 265.
Bring next digit (9) of the dividend behind the 265 and repeat the process: 2659 / 643

Moving on to step 8:
If we divide 2659 by 643, we get 4 and a remainder of 87.
Record the quotient 4 as the next digit in the result. 
Result so far: 100114.0
If we take 2572 away from 2659, we end up with 87.
Since there are no more digits in the dividend, we add a zero to the remainder making it 870, and continue the process.

Going ahead to step 9:
If we divide 870 by 643, we get 1 and a remainder of 227.
Write down 1 as next digit of the result. 
Result so far: 100114.1
Deduct 643 from 870 and we're left with 227.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2270, and continue the process.

Let's proceed to step 10:
643 can be fit into 2270 3 times, resulting in a remainder of 341.
Use 3 as the next digit of our solution. 
Result so far: 100114.13
Subtracting 1929 from 2270 leaves us with 341.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3410, and continue the process.

Advancing to step 11:
3410 divided by 643 is 5 with a remainder of 195.
Use 5 as the next digit of our solution. 
Result so far: 100114.135
If we subtract 3215 from 3410, we get 195.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1950, and continue the process.

Advancing to step 12:
The number 643 fits into 1950 3 times, leaving a remainder of 21.
Put 3 as the next digit of the answer. 
Result so far: 100114.1353
Subtracting 1929 from 1950 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.

On to step 13:
When dividing 210 by 643, we get 0 with a remainder of 210.
Use 0 as the next digit of our solution. 
Result so far: 100114.1353
Subtract 0 from 210 to get 210.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2100, and continue the process.

Going ahead to step 14:
When dividing 2100 by 643, we get 3 with a remainder of 171.
Use 3 as the next digit of our solution. 
Result so far: 100114.135303
If we take 1929 away from 2100, we end up with 171.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1710, and continue the process.

Moving on to step 15:
1710 divided by 643 is 2 with a remainder of 424.
The number 2 becomes the next digit in our result. 
Result so far: 100114.1353032
The remainder is 424 after subtracting 1286 from 1710.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4240, and continue the process.

Going ahead to step 16:
4240 divided by 643 is 6 with a remainder of 382.
The number 6 becomes the next digit in our result. 
Result so far: 100114.13530326
Subtracting 3858 from 4240 leaves us with 382.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3820, and continue the process.

The final outcome is 100114.13530326, with a leftover of 3.82e-07.