83615057 divided by 644 
Let's see how many times 644 fits into 83615057.

Let's proceed to step 1:
644 goes into 8 0 times with a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 8, we end up with 8.
Take the next digit (3) from the dividend and append it to 8, then repeat: 83 / 644

Let's proceed to step 2:
83 divided by 644 is 0 with a remainder of 83.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 83 and we're left with 83.
Append the next digit (6) from the dividend to 83 and continue with: 836 / 644

Moving on to step 3:
If we divide 836 by 644, we get 1 and a remainder of 192.
The next digit of our result is 1. 
Result so far: 1.0
Deduct 644 from 836 and we're left with 192.
Grab the next digit (1) from the dividend, add it to 192, then carry on: 1921 / 644

Let's proceed to step 4:
1921 divided by 644 is 2 with a remainder of 633.
Put 2 as the next digit of the answer. 
Result so far: 12.0
If we take 1288 away from 1921, we end up with 633.
Fetch the next digit (5) from the dividend, attach it to 633 and continue: 6335 / 644

On to step 5:
6335 divided by 644 is 9 with a remainder of 539.
The next digit of our result is 9. 
Result so far: 129.0
If we take 5796 away from 6335, we end up with 539.
Include the next digit (0) from the dividend after 539, then repeat: 5390 / 644

Let's proceed to step 6:
If we divide 5390 by 644, we get 8 and a remainder of 238.
The number 8 becomes the next digit in our result. 
Result so far: 1298.0
Deduct 5152 from 5390 and we're left with 238.
Take the next digit (5) from the dividend and append it to 238, then repeat: 2385 / 644

Moving on to step 7:
When dividing 2385 by 644, we get 3 with a remainder of 453.
The next digit of our result is 3. 
Result so far: 12983.0
If we subtract 1932 from 2385, we get 453.
Append the next digit (7) from the dividend to 453 and continue with: 4537 / 644

Step 8:
4537 divided by 644 is 7 with a remainder of 29.
Put 7 as the next digit of the answer. 
Result so far: 129837.0
Subtract 4508 from 4537 to get 29.
Since there are no more digits in the dividend, we add a zero to the remainder making it 290, and continue the process.

Advancing to step 9:
The number 644 fits into 290 0 times, leaving a remainder of 290.
The next digit of our result is 0. 
Result so far: 129837.0
If we subtract 0 from 290, we get 290.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2900, and continue the process.

Let's proceed to step 10:
The number 644 fits into 2900 4 times, leaving a remainder of 324.
The next digit of our result is 4. 
Result so far: 129837.04
The remainder is 324 after subtracting 2576 from 2900.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3240, and continue the process.

On to step 11:
644 goes into 3240 5 times with a remainder of 20.
Put 5 as the next digit of the answer. 
Result so far: 129837.045
If we take 3220 away from 3240, we end up with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Going ahead to step 12:
When dividing 200 by 644, we get 0 with a remainder of 200.
The number 0 becomes the next digit in our result. 
Result so far: 129837.045
If we subtract 0 from 200, we get 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2000, and continue the process.

Step 13:
If we divide 2000 by 644, we get 3 and a remainder of 68.
The number 3 becomes the next digit in our result. 
Result so far: 129837.04503
Subtracting 1932 from 2000 leaves us with 68.
Since there are no more digits in the dividend, we add a zero to the remainder making it 680, and continue the process.

Let's proceed to step 14:
644 can be fit into 680 1 times, resulting in a remainder of 36.
The next digit of our result is 1. 
Result so far: 129837.045031
Deduct 644 from 680 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.

Let's proceed to step 15:
If we divide 360 by 644, we get 0 and a remainder of 360.
Write down 0 as next digit of the result. 
Result so far: 129837.045031
If we take 0 away from 360, we end up with 360.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3600, and continue the process.

Advancing to step 16:
The number 644 fits into 3600 5 times, leaving a remainder of 380.
The next digit of our result is 5. 
Result so far: 129837.04503105
If we subtract 3220 from 3600, we get 380.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3800, and continue the process.

After the division, we end up with 129837.04503105 and a remainder of 3.8e-07.