We're dividing 27436003 by 644 
We want to figure out the number of times 27436003 can be divided by 644.

On to step 1:
2 divided by 644 is 0 with a remainder of 2.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 2 to get 2.
Bring next digit (7) of the dividend behind the 2 and repeat the process: 27 / 644

On to step 2:
644 can be fit into 27 0 times, resulting in a remainder of 27.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 27 after subtracting 0 from 27.
Bring next digit (4) of the dividend behind the 27 and repeat the process: 274 / 644

Moving on to step 3:
644 can be fit into 274 0 times, resulting in a remainder of 274.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 274, we end up with 274.
Append the next digit (3) from the dividend to 274 and continue with: 2743 / 644

Let's proceed to step 4:
When dividing 2743 by 644, we get 4 with a remainder of 167.
Record the quotient 4 as the next digit in the result. 
Result so far: 4.0
If we take 2576 away from 2743, we end up with 167.
Take the next digit (6) from the dividend and append it to 167, then repeat: 1676 / 644

Moving on to step 5:
644 goes into 1676 2 times with a remainder of 388.
The number 2 becomes the next digit in our result. 
Result so far: 42.0
If we take 1288 away from 1676, we end up with 388.
Include the next digit (0) from the dividend after 388, then repeat: 3880 / 644

Advancing to step 6:
644 goes into 3880 6 times with a remainder of 16.
Put 6 as the next digit of the answer. 
Result so far: 426.0
The remainder is 16 after subtracting 3864 from 3880.
Grab the next digit (0) from the dividend, add it to 16, then carry on: 160 / 644

Advancing to step 7:
The number 644 fits into 160 0 times, leaving a remainder of 160.
The number 0 becomes the next digit in our result. 
Result so far: 4260.0
If we subtract 0 from 160, we get 160.
Bring next digit (3) of the dividend behind the 160 and repeat the process: 1603 / 644

Step 8:
If we divide 1603 by 644, we get 2 and a remainder of 315.
The next digit of our result is 2. 
Result so far: 42602.0
If we subtract 1288 from 1603, we get 315.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3150, and continue the process.

On to step 9:
644 goes into 3150 4 times with a remainder of 574.
Use 4 as the next digit of our solution. 
Result so far: 42602.4
Subtract 2576 from 3150 to get 574.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5740, and continue the process.

Going ahead to step 10:
5740 divided by 644 is 8 with a remainder of 588.
The number 8 becomes the next digit in our result. 
Result so far: 42602.48
Subtracting 5152 from 5740 leaves us with 588.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5880, and continue the process.

On to step 11:
644 can be fit into 5880 9 times, resulting in a remainder of 84.
The next digit of our result is 9. 
Result so far: 42602.489
The remainder is 84 after subtracting 5796 from 5880.
Since there are no more digits in the dividend, we add a zero to the remainder making it 840, and continue the process.

Advancing to step 12:
The number 644 fits into 840 1 times, leaving a remainder of 196.
The next digit of our result is 1. 
Result so far: 42602.4891
Deduct 644 from 840 and we're left with 196.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1960, and continue the process.

Advancing to step 13:
644 goes into 1960 3 times with a remainder of 28.
Record the quotient 3 as the next digit in the result. 
Result so far: 42602.48913
Deduct 1932 from 1960 and we're left with 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Step 14:
644 can be fit into 280 0 times, resulting in a remainder of 280.
The number 0 becomes the next digit in our result. 
Result so far: 42602.48913
Subtracting 0 from 280 leaves us with 280.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2800, and continue the process.

Moving on to step 15:
When dividing 2800 by 644, we get 4 with a remainder of 224.
Use 4 as the next digit of our solution. 
Result so far: 42602.4891304
Subtracting 2576 from 2800 leaves us with 224.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2240, and continue the process.

Going ahead to step 16:
The number 644 fits into 2240 3 times, leaving a remainder of 308.
Put 3 as the next digit of the answer. 
Result so far: 42602.48913043
Subtracting 1932 from 2240 leaves us with 308.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3080, and continue the process.

After the division, we end up with 42602.48913043 and a remainder of 3.08e-07.