We divide 15801642 by 800
We want to figure out the number of times 15801642 can be divided by 800.

Step 1:
800 goes into 1 0 times with a remainder of 1.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 1 to get 1.
Grab the next digit (5) from the dividend, add it to 1, then carry on: 15 / 800

Going ahead to step 2:
800 goes into 15 0 times with a remainder of 15.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 15 and we're left with 15.
Take the next digit (8) from the dividend and append it to 15, then repeat: 158 / 800

On to step 3:
800 goes into 158 0 times with a remainder of 158.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 158 leaves us with 158.
Append the next digit (0) from the dividend to 158 and continue with: 1580 / 800

Step 4:
When dividing 1580 by 800, we get 1 with a remainder of 780.
The next digit of our result is 1. 
Result so far: 1.0
If we take 800 away from 1580, we end up with 780.
Append the next digit (1) from the dividend to 780 and continue with: 7801 / 800

On to step 5:
7801 divided by 800 is 9 with a remainder of 601.
Use 9 as the next digit of our solution. 
Result so far: 19.0
If we subtract 7200 from 7801, we get 601.
Bring next digit (6) of the dividend behind the 601 and repeat the process: 6016 / 800

Moving on to step 6:
800 goes into 6016 7 times with a remainder of 416.
Write down 7 as next digit of the result. 
Result so far: 197.0
The remainder is 416 after subtracting 5600 from 6016.
Fetch the next digit (4) from the dividend, attach it to 416 and continue: 4164 / 800

Step 7:
4164 divided by 800 is 5 with a remainder of 164.
The next digit of our result is 5. 
Result so far: 1975.0
Subtract 4000 from 4164 to get 164.
Fetch the next digit (2) from the dividend, attach it to 164 and continue: 1642 / 800

Moving on to step 8:
The number 800 fits into 1642 2 times, leaving a remainder of 42.
Write down 2 as next digit of the result. 
Result so far: 19752.0
Subtract 1600 from 1642 to get 42.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Step 9:
420 divided by 800 is 0 with a remainder of 420.
The number 0 becomes the next digit in our result. 
Result so far: 19752.0
Subtracting 0 from 420 leaves us with 420.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4200, and continue the process.

Moving on to step 10:
The number 800 fits into 4200 5 times, leaving a remainder of 200.
Use 5 as the next digit of our solution. 
Result so far: 19752.05
Subtracting 4000 from 4200 leaves us with 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2000, and continue the process.

Moving on to step 11:
800 can be fit into 2000 2 times, resulting in a remainder of 400.
Write down 2 as next digit of the result. 
Result so far: 19752.052
Deduct 1600 from 2000 and we're left with 400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4000, and continue the process.

Let's proceed to step 12:
The number 800 fits into 4000 5 times, leaving a remainder of 0.
Write down 5 as next digit of the result. 
Result so far: 19752.0525
If we take 4000 away from 4000, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Going ahead to step 13:
When dividing 0 by 800, we get 0 with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 19752.0525
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 14:
0 divided by 800 is 0 with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 19752.0525
Subtract 0 from 0 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Our division results in 19752.0525 with a remaining 0.0.