166991 ÷ 43 
We're looking to find how many times 43 goes into 166991.

Let's proceed to step 1:
The number 43 fits into 1 0 times, leaving a remainder of 1.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 1, we end up with 1.
Include the next digit (6) from the dividend after 1, then repeat: 16 / 43

Step 2:
If we divide 16 by 43, we get 0 and a remainder of 16.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 16 to get 16.
Bring next digit (6) of the dividend behind the 16 and repeat the process: 166 / 43

On to step 3:
43 goes into 166 3 times with a remainder of 37.
Use 3 as the next digit of our solution. 
Result so far: 3.0
If we subtract 129 from 166, we get 37.
Append the next digit (9) from the dividend to 37 and continue with: 379 / 43

Moving on to step 4:
43 goes into 379 8 times with a remainder of 35.
Write down 8 as next digit of the result. 
Result so far: 38.0
Subtracting 344 from 379 leaves us with 35.
Fetch the next digit (9) from the dividend, attach it to 35 and continue: 359 / 43

On to step 5:
The number 43 fits into 359 8 times, leaving a remainder of 15.
Use 8 as the next digit of our solution. 
Result so far: 388.0
If we subtract 344 from 359, we get 15.
Grab the next digit (1) from the dividend, add it to 15, then carry on: 151 / 43

Moving on to step 6:
43 can be fit into 151 3 times, resulting in a remainder of 22.
The number 3 becomes the next digit in our result. 
Result so far: 3883.0
The remainder is 22 after subtracting 129 from 151.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

Going ahead to step 7:
220 divided by 43 is 5 with a remainder of 5.
The next digit of our result is 5. 
Result so far: 3883.5
If we subtract 215 from 220, we get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Going ahead to step 8:
If we divide 50 by 43, we get 1 and a remainder of 7.
The next digit of our result is 1. 
Result so far: 3883.51
Deduct 43 from 50 and we're left with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Advancing to step 9:
If we divide 70 by 43, we get 1 and a remainder of 27.
Write down 1 as next digit of the result. 
Result so far: 3883.511
The remainder is 27 after subtracting 43 from 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 270, and continue the process.

Our division results in 3883.511 with a remaining 0.0027.