We look at the division of 7973730 by 644 
Let's see how many times 644 fits into 7973730.

Going ahead to step 1:
7 divided by 644 is 0 with a remainder of 7.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 7, we get 7.
Take the next digit (9) from the dividend and append it to 7, then repeat: 79 / 644

On to step 2:
644 goes into 79 0 times with a remainder of 79.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 79 to get 79.
Bring next digit (7) of the dividend behind the 79 and repeat the process: 797 / 644

Advancing to step 3:
797 divided by 644 is 1 with a remainder of 153.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Subtracting 644 from 797 leaves us with 153.
Grab the next digit (3) from the dividend, add it to 153, then carry on: 1533 / 644

Step 4:
If we divide 1533 by 644, we get 2 and a remainder of 245.
Use 2 as the next digit of our solution. 
Result so far: 12.0
Subtract 1288 from 1533 to get 245.
Fetch the next digit (7) from the dividend, attach it to 245 and continue: 2457 / 644

Advancing to step 5:
The number 644 fits into 2457 3 times, leaving a remainder of 525.
Record the quotient 3 as the next digit in the result. 
Result so far: 123.0
Subtracting 1932 from 2457 leaves us with 525.
Bring next digit (3) of the dividend behind the 525 and repeat the process: 5253 / 644

Going ahead to step 6:
If we divide 5253 by 644, we get 8 and a remainder of 101.
The number 8 becomes the next digit in our result. 
Result so far: 1238.0
The remainder is 101 after subtracting 5152 from 5253.
Include the next digit (0) from the dividend after 101, then repeat: 1010 / 644

Let's proceed to step 7:
1010 divided by 644 is 1 with a remainder of 366.
Put 1 as the next digit of the answer. 
Result so far: 12381.0
Subtracting 644 from 1010 leaves us with 366.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3660, and continue the process.

On to step 8:
644 can be fit into 3660 5 times, resulting in a remainder of 440.
Write down 5 as next digit of the result. 
Result so far: 12381.5
Subtracting 3220 from 3660 leaves us with 440.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4400, and continue the process.

Going ahead to step 9:
4400 divided by 644 is 6 with a remainder of 536.
Record the quotient 6 as the next digit in the result. 
Result so far: 12381.56
If we subtract 3864 from 4400, we get 536.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5360, and continue the process.

Step 10:
When dividing 5360 by 644, we get 8 with a remainder of 208.
Record the quotient 8 as the next digit in the result. 
Result so far: 12381.568
Deduct 5152 from 5360 and we're left with 208.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2080, and continue the process.

Step 11:
2080 divided by 644 is 3 with a remainder of 148.
Record the quotient 3 as the next digit in the result. 
Result so far: 12381.5683
If we take 1932 away from 2080, we end up with 148.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1480, and continue the process.

Step 12:
644 can be fit into 1480 2 times, resulting in a remainder of 192.
The next digit of our result is 2. 
Result so far: 12381.56832
The remainder is 192 after subtracting 1288 from 1480.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1920, and continue the process.

Advancing to step 13:
1920 divided by 644 is 2 with a remainder of 632.
Use 2 as the next digit of our solution. 
Result so far: 12381.568322
The remainder is 632 after subtracting 1288 from 1920.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6320, and continue the process.

The final outcome is 12381.568322, with a leftover of 6.32e-05.