We're dividing 43489561 by 166 
We want to figure out the number of times 43489561 can be divided by 166.

Step 1:
If we divide 4 by 166, we get 0 and a remainder of 4.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 4 leaves us with 4.
Include the next digit (3) from the dividend after 4, then repeat: 43 / 166

Advancing to step 2:
43 divided by 166 is 0 with a remainder of 43.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 43 to get 43.
Include the next digit (4) from the dividend after 43, then repeat: 434 / 166

Let's proceed to step 3:
If we divide 434 by 166, we get 2 and a remainder of 102.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
Subtract 332 from 434 to get 102.
Take the next digit (8) from the dividend and append it to 102, then repeat: 1028 / 166

Step 4:
1028 divided by 166 is 6 with a remainder of 32.
The number 6 becomes the next digit in our result. 
Result so far: 26.0
Deduct 996 from 1028 and we're left with 32.
Append the next digit (9) from the dividend to 32 and continue with: 329 / 166

Let's proceed to step 5:
When dividing 329 by 166, we get 1 with a remainder of 163.
Put 1 as the next digit of the answer. 
Result so far: 261.0
Subtract 166 from 329 to get 163.
Include the next digit (5) from the dividend after 163, then repeat: 1635 / 166

Advancing to step 6:
1635 divided by 166 is 9 with a remainder of 141.
Write down 9 as next digit of the result. 
Result so far: 2619.0
Deduct 1494 from 1635 and we're left with 141.
Bring next digit (6) of the dividend behind the 141 and repeat the process: 1416 / 166

On to step 7:
166 can be fit into 1416 8 times, resulting in a remainder of 88.
The number 8 becomes the next digit in our result. 
Result so far: 26198.0
The remainder is 88 after subtracting 1328 from 1416.
Bring next digit (1) of the dividend behind the 88 and repeat the process: 881 / 166

Let's proceed to step 8:
166 can be fit into 881 5 times, resulting in a remainder of 51.
Use 5 as the next digit of our solution. 
Result so far: 261985.0
Deduct 830 from 881 and we're left with 51.
Since there are no more digits in the dividend, we add a zero to the remainder making it 510, and continue the process.

Going ahead to step 9:
166 goes into 510 3 times with a remainder of 12.
Use 3 as the next digit of our solution. 
Result so far: 261985.3
If we subtract 498 from 510, we get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Going ahead to step 10:
120 divided by 166 is 0 with a remainder of 120.
The next digit of our result is 0. 
Result so far: 261985.3
Subtracting 0 from 120 leaves us with 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1200, and continue the process.

On to step 11:
1200 divided by 166 is 7 with a remainder of 38.
Put 7 as the next digit of the answer. 
Result so far: 261985.307
Subtracting 1162 from 1200 leaves us with 38.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

Let's proceed to step 12:
When dividing 380 by 166, we get 2 with a remainder of 48.
Record the quotient 2 as the next digit in the result. 
Result so far: 261985.3072
If we take 332 away from 380, we end up with 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

Going ahead to step 13:
166 goes into 480 2 times with a remainder of 148.
Write down 2 as next digit of the result. 
Result so far: 261985.30722
If we take 332 away from 480, we end up with 148.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1480, and continue the process.

After the division, we end up with 261985.30722 and a remainder of 0.000148.