We're dividing 12098966 by 644 
Let's see how many times 644 fits into 12098966.

Let's proceed to step 1:
1 divided by 644 is 0 with a remainder of 1.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 1 leaves us with 1.
Include the next digit (2) from the dividend after 1, then repeat: 12 / 644

Step 2:
When dividing 12 by 644, we get 0 with a remainder of 12.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 12, we get 12.
Bring next digit (0) of the dividend behind the 12 and repeat the process: 120 / 644

Advancing to step 3:
The number 644 fits into 120 0 times, leaving a remainder of 120.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 120 and we're left with 120.
Grab the next digit (9) from the dividend, add it to 120, then carry on: 1209 / 644

On to step 4:
1209 divided by 644 is 1 with a remainder of 565.
Use 1 as the next digit of our solution. 
Result so far: 1.0
The remainder is 565 after subtracting 644 from 1209.
Take the next digit (8) from the dividend and append it to 565, then repeat: 5658 / 644

Moving on to step 5:
If we divide 5658 by 644, we get 8 and a remainder of 506.
Use 8 as the next digit of our solution. 
Result so far: 18.0
If we subtract 5152 from 5658, we get 506.
Grab the next digit (9) from the dividend, add it to 506, then carry on: 5069 / 644

Step 6:
The number 644 fits into 5069 7 times, leaving a remainder of 561.
Record the quotient 7 as the next digit in the result. 
Result so far: 187.0
If we take 4508 away from 5069, we end up with 561.
Grab the next digit (6) from the dividend, add it to 561, then carry on: 5616 / 644

Step 7:
The number 644 fits into 5616 8 times, leaving a remainder of 464.
The number 8 becomes the next digit in our result. 
Result so far: 1878.0
Subtract 5152 from 5616 to get 464.
Include the next digit (6) from the dividend after 464, then repeat: 4646 / 644

Step 8:
644 can be fit into 4646 7 times, resulting in a remainder of 138.
The number 7 becomes the next digit in our result. 
Result so far: 18787.0
If we take 4508 away from 4646, we end up with 138.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1380, and continue the process.

Moving on to step 9:
The number 644 fits into 1380 2 times, leaving a remainder of 92.
Write down 2 as next digit of the result. 
Result so far: 18787.2
Subtracting 1288 from 1380 leaves us 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.

Let's proceed to step 10:
920 divided by 644 is 1 with a remainder of 276.
Write down 1 as next digit of the result. 
Result so far: 18787.21
The remainder is 276 after subtracting 644 from 920.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2760, and continue the process.

Moving on to step 11:
When dividing 2760 by 644, we get 4 with a remainder of 184.
Write down 4 as next digit of the result. 
Result so far: 18787.214
The remainder is 184 after subtracting 2576 from 2760.
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 12:
When dividing 1840 by 644, we get 2 with a remainder of 552.
Use 2 as the next digit of our solution. 
Result so far: 18787.2142
Deduct 1288 from 1840 and we're left with 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 13:
The number 644 fits into 5520 8 times, leaving a remainder of 368.
The next digit of our result is 8. 
Result so far: 18787.21428
If we take 5152 away from 5520, we end up 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.

Advancing to step 14:
When dividing 3680 by 644, we get 5 with a remainder of 460.
Record the quotient 5 as the next digit in the result. 
Result so far: 18787.214285
Deduct 3220 from 3680 and we're left with 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 15:
644 can be fit into 4600 7 times, resulting in a remainder of 92.
Record the quotient 7 as the next digit in the result. 
Result so far: 18787.2142857
Deduct 4508 from 4600 and we're left 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.

Advancing to step 16:
If we divide 920 by 644, we get 1 and a remainder of 276.
Use 1 as the next digit of our solution. 
Result so far: 18787.21428571
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.

The final outcome is 18787.21428571, with a leftover of 2.76e-07.