We're dividing 15555435 by 800 
We're looking to find how many times 800 goes into 15555435.

Moving on to step 1:
800 can be fit into 1 0 times, resulting in 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

Step 2:
If we divide 15 by 800, we get 0 and a remainder of 15.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 15, we get 15.
Take the next digit (5) from the dividend and append it to 15, then repeat: 155 / 800

Step 3:
155 divided by 800 is 0 with a remainder of 155.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 155 and we're left with 155.
Fetch the next digit (5) from the dividend, attach it to 155 and continue: 1555 / 800

Moving on to step 4:
If we divide 1555 by 800, we get 1 and a remainder of 755.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
The remainder is 755 after subtracting 800 from 1555.
Take the next digit (5) from the dividend and append it to 755, then repeat: 7555 / 800

Advancing to step 5:
800 goes into 7555 9 times with a remainder of 355.
The number 9 becomes the next digit in our result. 
Result so far: 19.0
If we subtract 7200 from 7555, we get 355.
Take the next digit (4) from the dividend and append it to 355, then repeat: 3554 / 800

Going ahead to step 6:
The number 800 fits into 3554 4 times, leaving a remainder of 354.
The number 4 becomes the next digit in our result. 
Result so far: 194.0
Subtracting 3200 from 3554 leaves us with 354.
Take the next digit (3) from the dividend and append it to 354, then repeat: 3543 / 800

On to step 7:
3543 divided by 800 is 4 with a remainder of 343.
Put 4 as the next digit of the answer. 
Result so far: 1944.0
The remainder is 343 after subtracting 3200 from 3543.
Append the next digit (5) from the dividend to 343 and continue with: 3435 / 800

Step 8:
When dividing 3435 by 800, we get 4 with a remainder of 235.
Write down 4 as next digit of the result. 
Result so far: 19444.0
Subtract 3200 from 3435 to get 235.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2350, and continue the process.

Moving on to step 9:
The number 800 fits into 2350 2 times, leaving a remainder of 750.
Record the quotient 2 as the next digit in the result. 
Result so far: 19444.2
If we subtract 1600 from 2350, we get 750.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7500, and continue the process.

Moving on to step 10:
When dividing 7500 by 800, we get 9 with a remainder of 300.
The number 9 becomes the next digit in our result. 
Result so far: 19444.29
If we subtract 7200 from 7500, we get 300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3000, and continue the process.

Moving on to step 11:
3000 divided by 800 is 3 with a remainder of 600.
Write down 3 as next digit of the result. 
Result so far: 19444.293
Subtracting 2400 from 3000 leaves us 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.

Going ahead to step 12:
800 can be fit into 6000 7 times, resulting in a remainder of 400.
The next digit of our result is 7. 
Result so far: 19444.2937
Deduct 5600 from 6000 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.

Advancing to step 13:
4000 divided by 800 is 5 with a remainder of 0.
Put 5 as the next digit of the answer. 
Result so far: 19444.29375
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 14:
800 can be fit into 0 0 times, resulting in a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 19444.29375
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.

Let's proceed to step 15:
The number 800 fits into 0 0 times, leaving a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 19444.29375
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.

After the division, we end up with 19444.29375 and a remainder of 0.0.