Let's divide 45398731 by 166
We want to figure out the number of times 45398731 can be divided by 166.

On to step 1:
When dividing 4 by 166, we get 0 with a remainder of 4.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 4 after subtracting 0 from 4.
Take the next digit (5) from the dividend and append it to 4, then repeat: 45 / 166

Going ahead to step 2:
The number 166 fits into 45 0 times, leaving a remainder of 45.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 45 and we're left with 45.
Include the next digit (3) from the dividend after 45, then repeat: 453 / 166

Step 3:
453 divided by 166 is 2 with a remainder of 121.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
Subtracting 332 from 453 leaves us with 121.
Grab the next digit (9) from the dividend, add it to 121, then carry on: 1219 / 166

Moving on to step 4:
166 can be fit into 1219 7 times, resulting in a remainder of 57.
The next digit of our result is 7. 
Result so far: 27.0
If we subtract 1162 from 1219, we get 57.
Include the next digit (8) from the dividend after 57, then repeat: 578 / 166

On to step 5:
166 goes into 578 3 times with a remainder of 80.
The next digit of our result is 3. 
Result so far: 273.0
The remainder is 80 after subtracting 498 from 578.
Grab the next digit (7) from the dividend, add it to 80, then carry on: 807 / 166

On to step 6:
The number 166 fits into 807 4 times, leaving a remainder of 143.
Put 4 as the next digit of the answer. 
Result so far: 2734.0
If we take 664 away from 807, we end up with 143.
Take the next digit (3) from the dividend and append it to 143, then repeat: 1433 / 166

Moving on to step 7:
166 can be fit into 1433 8 times, resulting in a remainder of 105.
The number 8 becomes the next digit in our result. 
Result so far: 27348.0
Subtracting 1328 from 1433 leaves us with 105.
Bring next digit (1) of the dividend behind the 105 and repeat the process: 1051 / 166

Moving on to step 8:
If we divide 1051 by 166, we get 6 and a remainder of 55.
Write down 6 as next digit of the result. 
Result so far: 273486.0
Subtract 996 from 1051 to get 55.
Since there are no more digits in the dividend, we add a zero to the remainder making it 550, and continue the process.

On to step 9:
550 divided by 166 is 3 with a remainder of 52.
Put 3 as the next digit of the answer. 
Result so far: 273486.3
Subtract 498 from 550 to get 52.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

Let's proceed to step 10:
The number 166 fits into 520 3 times, leaving a remainder of 22.
Write down 3 as next digit of the result. 
Result so far: 273486.33
Subtract 498 from 520 to get 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

In conclusion, the division gives 273486.33 with a balance of 0.022.