We look at the division of 81525989 by 166 
We want to divide 81525989 by 166.

Let's proceed to step 1:
166 goes into 8 0 times with a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 8 after subtracting 0 from 8.
Take the next digit (1) from the dividend and append it to 8, then repeat: 81 / 166

Going ahead to step 2:
The number 166 fits into 81 0 times, leaving a remainder of 81.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 81 and we're left with 81.
Bring next digit (5) of the dividend behind the 81 and repeat the process: 815 / 166

Step 3:
166 can be fit into 815 4 times, resulting in a remainder of 151.
The next digit of our result is 4. 
Result so far: 4.0
Subtracting 664 from 815 leaves us with 151.
Append the next digit (2) from the dividend to 151 and continue with: 1512 / 166

On to step 4:
When dividing 1512 by 166, we get 9 with a remainder of 18.
Write down 9 as next digit of the result. 
Result so far: 49.0
Subtracting 1494 from 1512 leaves us with 18.
Bring next digit (5) of the dividend behind the 18 and repeat the process: 185 / 166

Let's proceed to step 5:
166 goes into 185 1 times with a remainder of 19.
Put 1 as the next digit of the answer. 
Result so far: 491.0
The remainder is 19 after subtracting 166 from 185.
Take the next digit (9) from the dividend and append it to 19, then repeat: 199 / 166

Let's proceed to step 6:
166 can be fit into 199 1 times, resulting in a remainder of 33.
Write down 1 as next digit of the result. 
Result so far: 4911.0
Subtract 166 from 199 to get 33.
Append the next digit (8) from the dividend to 33 and continue with: 338 / 166

Moving on to step 7:
The number 166 fits into 338 2 times, leaving a remainder of 6.
Use 2 as the next digit of our solution. 
Result so far: 49112.0
The remainder is 6 after subtracting 332 from 338.
Bring next digit (9) of the dividend behind the 6 and repeat the process: 69 / 166

Going ahead to step 8:
The number 166 fits into 69 0 times, leaving a remainder of 69.
Put 0 as the next digit of the answer. 
Result so far: 491120.0
Subtracting 0 from 69 leaves us with 69.
Since there are no more digits in the dividend, we add a zero to the remainder making it 690, and continue the process.

Going ahead to step 9:
If we divide 690 by 166, we get 4 and a remainder of 26.
Use 4 as the next digit of our solution. 
Result so far: 491120.4
Deduct 664 from 690 and we're left with 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

On to step 10:
If we divide 260 by 166, we get 1 and a remainder of 94.
The number 1 becomes the next digit in our result. 
Result so far: 491120.41
Deduct 166 from 260 and we're left with 94.
Since there are no more digits in the dividend, we add a zero to the remainder making it 940, and continue the process.

Step 11:
940 divided by 166 is 5 with a remainder of 110.
The number 5 becomes the next digit in our result. 
Result so far: 491120.415
Subtract 830 from 940 to get 110.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1100, and continue the process.

Advancing to step 12:
1100 divided by 166 is 6 with a remainder of 104.
Record the quotient 6 as the next digit in the result. 
Result so far: 491120.4156
If we subtract 996 from 1100, we get 104.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1040, and continue the process.

Moving on to step 13:
When dividing 1040 by 166, we get 6 with a remainder of 44.
The number 6 becomes the next digit in our result. 
Result so far: 491120.41566
The remainder is 44 after subtracting 996 from 1040.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

Our division results in 491120.41566 with a remaining 4.4e-05.