We divide 12931683 by 645
We're looking to find how many times 645 goes into 12931683.

On to step 1:
When dividing 1 by 645, we get 0 with a remainder of 1.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 1 leaves us with 1.
Bring next digit (2) of the dividend behind the 1 and repeat the process: 12 / 645

Moving on to step 2:
12 divided by 645 is 0 with a remainder of 12.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 12 to get 12.
Fetch the next digit (9) from the dividend, attach it to 12 and continue: 129 / 645

Step 3:
645 goes into 129 0 times with a remainder of 129.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 129 and we're left with 129.
Include the next digit (3) from the dividend after 129, then repeat: 1293 / 645

Advancing to step 4:
1293 divided by 645 is 2 with a remainder of 3.
The next digit of our result is 2. 
Result so far: 2.0
Deduct 1290 from 1293 and we're left with 3.
Fetch the next digit (1) from the dividend, attach it to 3 and continue: 31 / 645

Step 5:
645 goes into 31 0 times with a remainder of 31.
Put 0 as the next digit of the answer. 
Result so far: 20.0
Subtracting 0 from 31 leaves us with 31.
Append the next digit (6) from the dividend to 31 and continue with: 316 / 645

Let's proceed to step 6:
If we divide 316 by 645, we get 0 and a remainder of 316.
The number 0 becomes the next digit in our result. 
Result so far: 200.0
The remainder is 316 after subtracting 0 from 316.
Append the next digit (8) from the dividend to 316 and continue with: 3168 / 645

On to step 7:
The number 645 fits into 3168 4 times, leaving a remainder of 588.
Write down 4 as next digit of the result. 
Result so far: 2004.0
Subtracting 2580 from 3168 leaves us with 588.
Fetch the next digit (3) from the dividend, attach it to 588 and continue: 5883 / 645

Step 8:
If we divide 5883 by 645, we get 9 and a remainder of 78.
Write down 9 as next digit of the result. 
Result so far: 20049.0
If we take 5805 away from 5883, we end up with 78.
Since there are no more digits in the dividend, we add a zero to the remainder making it 780, and continue the process.

Let's proceed to step 9:
645 can be fit into 780 1 times, resulting in a remainder of 135.
Write down 1 as next digit of the result. 
Result so far: 20049.1
If we subtract 645 from 780, we get 135.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1350, and continue the process.

Step 10:
645 goes into 1350 2 times with a remainder of 60.
Write down 2 as next digit of the result. 
Result so far: 20049.12
If we take 1290 away from 1350, we end up with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Let's proceed to step 11:
600 divided by 645 is 0 with a remainder of 600.
The number 0 becomes the next digit in our result. 
Result so far: 20049.12
Subtract 0 from 600 to get 600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6000, and continue the process.

Step 12:
When dividing 6000 by 645, we get 9 with a remainder of 195.
Record the quotient 9 as the next digit in the result. 
Result so far: 20049.1209
The remainder is 195 after subtracting 5805 from 6000.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1950, and continue the process.

Let's proceed to step 13:
When dividing 1950 by 645, we get 3 with a remainder of 15.
Use 3 as the next digit of our solution. 
Result so far: 20049.12093
If we take 1935 away from 1950, we end up with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Going ahead to step 14:
If we divide 150 by 645, we get 0 and a remainder of 150.
Record the quotient 0 as the next digit in the result. 
Result so far: 20049.12093
The remainder is 150 after subtracting 0 from 150.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1500, and continue the process.

Going ahead to step 15:
1500 divided by 645 is 2 with a remainder of 210.
The number 2 becomes the next digit in our result. 
Result so far: 20049.1209302
Deduct 1290 from 1500 and we're left with 210.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2100, and continue the process.

Moving on to step 16:
645 can be fit into 2100 3 times, resulting in a remainder of 165.
The next digit of our result is 3. 
Result so far: 20049.12093023
Subtract 1935 from 2100 to get 165.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1650, and continue the process.

After the division, we end up with 20049.12093023 and a remainder of 1.65e-07.