171641 ÷ 80 
We want to figure out the number of times 171641 can be divided by 80.

Let's proceed to step 1:
1 divided by 80 is 0 with a remainder of 1.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Include the next digit (7) from the dividend after 1, then repeat: 17 / 80

Step 2:
The number 80 fits into 17 0 times, leaving a remainder of 17.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 17 and we're left with 17.
Include the next digit (1) from the dividend after 17, then repeat: 171 / 80

Let's proceed to step 3:
80 goes into 171 2 times with a remainder of 11.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
If we subtract 160 from 171, we get 11.
Bring next digit (6) of the dividend behind the 11 and repeat the process: 116 / 80

Advancing to step 4:
If we divide 116 by 80, we get 1 and a remainder of 36.
The number 1 becomes the next digit in our result. 
Result so far: 21.0
If we take 80 away from 116, we end up with 36.
Fetch the next digit (4) from the dividend, attach it to 36 and continue: 364 / 80

On to step 5:
364 divided by 80 is 4 with a remainder of 44.
Write down 4 as next digit of the result. 
Result so far: 214.0
Subtracting 320 from 364 leaves us with 44.
Append the next digit (1) from the dividend to 44 and continue with: 441 / 80

Advancing to step 6:
80 can be fit into 441 5 times, resulting in a remainder of 41.
The next digit of our result is 5. 
Result so far: 2145.0
If we subtract 400 from 441, we get 41.
Since there are no more digits in the dividend, we add a zero to the remainder making it 410, and continue the process.

Let's proceed to step 7:
The number 80 fits into 410 5 times, leaving a remainder of 10.
The number 5 becomes the next digit in our result. 
Result so far: 2145.5
The remainder is 10 after subtracting 400 from 410.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Advancing to step 8:
80 goes into 100 1 times with a remainder of 20.
The next digit of our result is 1. 
Result so far: 2145.51
Subtracting 80 from 100 leaves us with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

On to step 9:
80 can be fit into 200 2 times, resulting in a remainder of 40.
Record the quotient 2 as the next digit in the result. 
Result so far: 2145.512
Subtract 160 from 200 to get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Let's proceed to step 10:
80 can be fit into 400 5 times, resulting in a remainder of 0.
Use 5 as the next digit of our solution. 
Result so far: 2145.5125
If we subtract 400 from 400, 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 11:
When dividing 0 by 80, we get 0 with a remainder of 0.
The next digit of our result is 0. 
Result so far: 2145.5125
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.

Let's proceed to step 12:
The number 80 fits into 0 0 times, leaving a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 2145.5125
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.

The final outcome is 2145.5125, with a leftover of 0.0.