We look at the division of 83912993 by 644 
We're looking to find how many times 644 goes into 83912993.

Let's proceed to step 1:
The number 644 fits into 8 0 times, leaving a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 8, we end up with 8.
Append the next digit (3) from the dividend to 8 and continue with: 83 / 644

Going ahead to step 2:
644 can be fit into 83 0 times, resulting in a remainder of 83.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 83 after subtracting 0 from 83.
Bring next digit (9) of the dividend behind the 83 and repeat the process: 839 / 644

Moving on to step 3:
839 divided by 644 is 1 with a remainder of 195.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Subtract 644 from 839 to get 195.
Take the next digit (1) from the dividend and append it to 195, then repeat: 1951 / 644

Advancing to step 4:
When dividing 1951 by 644, we get 3 with a remainder of 19.
Put 3 as the next digit of the answer. 
Result so far: 13.0
Subtracting 1932 from 1951 leaves us with 19.
Bring next digit (2) of the dividend behind the 19 and repeat the process: 192 / 644

Let's proceed to step 5:
192 divided by 644 is 0 with a remainder of 192.
Write down 0 as next digit of the result. 
Result so far: 130.0
Subtracting 0 from 192 leaves us with 192.
Fetch the next digit (9) from the dividend, attach it to 192 and continue: 1929 / 644

On to step 6:
644 can be fit into 1929 2 times, resulting in a remainder of 641.
Use 2 as the next digit of our solution. 
Result so far: 1302.0
Subtracting 1288 from 1929 leaves us with 641.
Include the next digit (9) from the dividend after 641, then repeat: 6419 / 644

Let's proceed to step 7:
644 goes into 6419 9 times with a remainder of 623.
The number 9 becomes the next digit in our result. 
Result so far: 13029.0
Subtract 5796 from 6419 to get 623.
Grab the next digit (3) from the dividend, add it to 623, then carry on: 6233 / 644

Let's proceed to step 8:
When dividing 6233 by 644, we get 9 with a remainder of 437.
The number 9 becomes the next digit in our result. 
Result so far: 130299.0
If we subtract 5796 from 6233, we get 437.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4370, and continue the process.

Let's proceed to step 9:
If we divide 4370 by 644, we get 6 and a remainder of 506.
Record the quotient 6 as the next digit in the result. 
Result so far: 130299.6
The remainder is 506 after subtracting 3864 from 4370.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5060, and continue the process.

Going ahead to step 10:
If we divide 5060 by 644, we get 7 and a remainder of 552.
Record the quotient 7 as the next digit in the result. 
Result so far: 130299.67
Subtract 4508 from 5060 to get 552.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5520, and continue the process.

Let's proceed to step 11:
644 can be fit into 5520 8 times, resulting in a remainder of 368.
Use 8 as the next digit of our solution. 
Result so far: 130299.678
Subtracting 5152 from 5520 leaves us with 368.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3680, and continue the process.

Step 12:
3680 divided by 644 is 5 with a remainder of 460.
Write down 5 as next digit of the result. 
Result so far: 130299.6785
If we subtract 3220 from 3680, we get 460.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4600, and continue the process.

Advancing to step 13:
4600 divided by 644 is 7 with a remainder of 92.
Use 7 as the next digit of our solution. 
Result so far: 130299.67857
If we take 4508 away from 4600, we end up with 92.
Since there are no more digits in the dividend, we add a zero to the remainder making it 920, and continue the process.

Step 14:
920 divided by 644 is 1 with a remainder of 276.
The number 1 becomes the next digit in our result. 
Result so far: 130299.678571
Subtracting 644 from 920 leaves us with 276.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2760, and continue the process.

Let's proceed to step 15:
If we divide 2760 by 644, we get 4 and a remainder of 184.
Put 4 as the next digit of the answer. 
Result so far: 130299.6785714
Deduct 2576 from 2760 and we're left with 184.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1840, and continue the process.

Advancing to step 16:
644 can be fit into 1840 2 times, resulting in a remainder of 552.
The next digit of our result is 2. 
Result so far: 130299.67857142
The remainder is 552 after subtracting 1288 from 1840.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5520, and continue the process.

The final result is 130299.67857142 with a remainder of 5.52e-07.