Let's divide 7158143 by 800
Our goal is to divide 7158143 by 800.

Going ahead to step 1:
The number 800 fits into 7 0 times, leaving a remainder of 7.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 7 to get 7.
Include the next digit (1) from the dividend after 7, then repeat: 71 / 800

Going ahead to step 2:
800 goes into 71 0 times with a remainder of 71.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 71, we end up with 71.
Fetch the next digit (5) from the dividend, attach it to 71 and continue: 715 / 800

Advancing to step 3:
715 divided by 800 is 0 with a remainder of 715.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 715, we get 715.
Take the next digit (8) from the dividend and append it to 715, then repeat: 7158 / 800

Step 4:
800 can be fit into 7158 8 times, resulting in a remainder of 758.
The number 8 becomes the next digit in our result. 
Result so far: 8.0
Subtracting 6400 from 7158 leaves us with 758.
Append the next digit (1) from the dividend to 758 and continue with: 7581 / 800

Moving on to step 5:
If we divide 7581 by 800, we get 9 and a remainder of 381.
Write down 9 as next digit of the result. 
Result so far: 89.0
Subtracting 7200 from 7581 leaves us with 381.
Append the next digit (4) from the dividend to 381 and continue with: 3814 / 800

Advancing to step 6:
When dividing 3814 by 800, we get 4 with a remainder of 614.
The next digit of our result is 4. 
Result so far: 894.0
Subtracting 3200 from 3814 leaves us with 614.
Append the next digit (3) from the dividend to 614 and continue with: 6143 / 800

On to step 7:
If we divide 6143 by 800, we get 7 and a remainder of 543.
Record the quotient 7 as the next digit in the result. 
Result so far: 8947.0
If we subtract 5600 from 6143, we get 543.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5430, and continue the process.

Advancing to step 8:
The number 800 fits into 5430 6 times, leaving a remainder of 630.
Record the quotient 6 as the next digit in the result. 
Result so far: 8947.6
If we subtract 4800 from 5430, we get 630.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6300, and continue the process.

Moving on to step 9:
800 can be fit into 6300 7 times, resulting in a remainder of 700.
Put 7 as the next digit of the answer. 
Result so far: 8947.67
Subtracting 5600 from 6300 leaves us with 700.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7000, and continue the process.

On to step 10:
800 goes into 7000 8 times with a remainder of 600.
The number 8 becomes the next digit in our result. 
Result so far: 8947.678
Deduct 6400 from 7000 and we're left with 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 11:
When dividing 6000 by 800, we get 7 with a remainder of 400.
Record the quotient 7 as the next digit in the result. 
Result so far: 8947.6787
If we subtract 5600 from 6000, we get 400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4000, and continue the process.

Going ahead to step 12:
The number 800 fits into 4000 5 times, leaving a remainder of 0.
The number 5 becomes the next digit in our result. 
Result so far: 8947.67875
If we subtract 4000 from 4000, we 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.

Going ahead to step 13:
When dividing 0 by 800, we get 0 with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 8947.67875
If we subtract 0 from 0, we 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.

Step 14:
800 goes into 0 0 times with a remainder of 0.
The next digit of our result is 0. 
Result so far: 8947.67875
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.

After the division, we end up with 8947.67875 and a remainder of 0.0.