172971 ÷ 91 
Let's see how many times 91 fits into 172971.

Step 1:
The number 91 fits into 1 0 times, leaving a remainder of 1.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 1 leaves us with 1.
Append the next digit (7) from the dividend to 1 and continue with: 17 / 91

Going ahead to step 2:
When dividing 17 by 91, we get 0 with a remainder of 17.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 17, we get 17.
Bring next digit (2) of the dividend behind the 17 and repeat the process: 172 / 91

On to step 3:
If we divide 172 by 91, we get 1 and a remainder of 81.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
The remainder is 81 after subtracting 91 from 172.
Grab the next digit (9) from the dividend, add it to 81, then carry on: 819 / 91

Going ahead to step 4:
When dividing 819 by 91, we get 9 with a remainder of 0.
Record the quotient 9 as the next digit in the result. 
Result so far: 19.0
If we subtract 819 from 819, we get 0.
Append the next digit (7) from the dividend to 0 and continue with: 7 / 91

Going ahead to step 5:
The number 91 fits into 7 0 times, leaving a remainder of 7.
Write down 0 as next digit of the result. 
Result so far: 190.0
If we take 0 away from 7, we end up with 7.
Take the next digit (1) from the dividend and append it to 7, then repeat: 71 / 91

Advancing to step 6:
When dividing 71 by 91, we get 0 with a remainder of 71.
Put 0 as the next digit of the answer. 
Result so far: 1900.0
The remainder is 71 after subtracting 0 from 71.
Since there are no more digits in the dividend, we add a zero to the remainder making it 710, and continue the process.

On to step 7:
The number 91 fits into 710 7 times, leaving a remainder of 73.
Write down 7 as next digit of the result. 
Result so far: 1900.7
The remainder is 73 after subtracting 637 from 710.
Since there are no more digits in the dividend, we add a zero to the remainder making it 730, and continue the process.

Step 8:
91 can be fit into 730 8 times, resulting in a remainder of 2.
Write down 8 as next digit of the result. 
Result so far: 1900.78
Deduct 728 from 730 and we're left with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Step 9:
91 can be fit into 20 0 times, resulting in a remainder of 20.
Use 0 as the next digit of our solution. 
Result so far: 1900.78
The remainder is 20 after subtracting 0 from 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Advancing to step 10:
200 divided by 91 is 2 with a remainder of 18.
Write down 2 as next digit of the result. 
Result so far: 1900.7802
If we subtract 182 from 200, we get 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Step 11:
The number 91 fits into 180 1 times, leaving a remainder of 89.
Put 1 as the next digit of the answer. 
Result so far: 1900.78021
Deduct 91 from 180 and we're left with 89.
Since there are no more digits in the dividend, we add a zero to the remainder making it 890, and continue the process.

Moving on to step 12:
91 goes into 890 9 times with a remainder of 71.
Write down 9 as next digit of the result. 
Result so far: 1900.780219
Subtract 819 from 890 to get 71.
Since there are no more digits in the dividend, we add a zero to the remainder making it 710, and continue the process.

Moving on to step 13:
91 can be fit into 710 7 times, resulting in a remainder of 73.
Use 7 as the next digit of our solution. 
Result so far: 1900.7802197
Subtract 637 from 710 to get 73.
Since there are no more digits in the dividend, we add a zero to the remainder making it 730, and continue the process.

On to step 14:
730 divided by 91 is 8 with a remainder of 2.
Use 8 as the next digit of our solution. 
Result so far: 1900.78021978
If we subtract 728 from 730, we get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

The final outcome is 1900.78021978, with a leftover of 2e-09.