Let's divide 99521637 by 645
We're looking to find how many times 645 goes into 99521637.

Going ahead to step 1:
9 divided by 645 is 0 with a remainder of 9.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 9 and we're left with 9.
Append the next digit (9) from the dividend to 9 and continue with: 99 / 645

Moving on to step 2:
99 divided by 645 is 0 with a remainder of 99.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 99 leaves us with 99.
Take the next digit (5) from the dividend and append it to 99, then repeat: 995 / 645

Moving on to step 3:
995 divided by 645 is 1 with a remainder of 350.
The next digit of our result is 1. 
Result so far: 1.0
Subtracting 645 from 995 leaves us with 350.
Include the next digit (2) from the dividend after 350, then repeat: 3502 / 645

Advancing to step 4:
645 goes into 3502 5 times with a remainder of 277.
Record the quotient 5 as the next digit in the result. 
Result so far: 15.0
If we subtract 3225 from 3502, we get 277.
Bring next digit (1) of the dividend behind the 277 and repeat the process: 2771 / 645

Advancing to step 5:
645 can be fit into 2771 4 times, resulting in a remainder of 191.
Write down 4 as next digit of the result. 
Result so far: 154.0
The remainder is 191 after subtracting 2580 from 2771.
Take the next digit (6) from the dividend and append it to 191, then repeat: 1916 / 645

On to step 6:
When dividing 1916 by 645, we get 2 with a remainder of 626.
Use 2 as the next digit of our solution. 
Result so far: 1542.0
Subtracting 1290 from 1916 leaves us with 626.
Append the next digit (3) from the dividend to 626 and continue with: 6263 / 645

Let's proceed to step 7:
645 goes into 6263 9 times with a remainder of 458.
Put 9 as the next digit of the answer. 
Result so far: 15429.0
Deduct 5805 from 6263 and we're left with 458.
Take the next digit (7) from the dividend and append it to 458, then repeat: 4587 / 645

Advancing to step 8:
When dividing 4587 by 645, we get 7 with a remainder of 72.
Use 7 as the next digit of our solution. 
Result so far: 154297.0
Deduct 4515 from 4587 and we're left with 72.
Since there are no more digits in the dividend, we add a zero to the remainder making it 720, and continue the process.

Advancing to step 9:
645 goes into 720 1 times with a remainder of 75.
Use 1 as the next digit of our solution. 
Result so far: 154297.1
Deduct 645 from 720 and we're left with 75.
Since there are no more digits in the dividend, we add a zero to the remainder making it 750, and continue the process.

Let's proceed to step 10:
When dividing 750 by 645, we get 1 with a remainder of 105.
Write down 1 as next digit of the result. 
Result so far: 154297.11
Deduct 645 from 750 and we're left with 105.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1050, and continue the process.

After the division, we end up with 154297.11 and a remainder of 0.105.