We look at the division of 78985623 by 166 
Our goal is to divide 78985623 by 166.

Step 1:
When dividing 7 by 166, we get 0 with a remainder of 7.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 7 to get 7.
Bring next digit (8) of the dividend behind the 7 and repeat the process: 78 / 166

Going ahead to step 2:
The number 166 fits into 78 0 times, leaving a remainder of 78.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 78 to get 78.
Take the next digit (9) from the dividend and append it to 78, then repeat: 789 / 166

Going ahead to step 3:
166 can be fit into 789 4 times, resulting in a remainder of 125.
The number 4 becomes the next digit in our result. 
Result so far: 4.0
If we take 664 away from 789, we end up with 125.
Bring next digit (8) of the dividend behind the 125 and repeat the process: 1258 / 166

Let's proceed to step 4:
166 goes into 1258 7 times with a remainder of 96.
Put 7 as the next digit of the answer. 
Result so far: 47.0
Subtract 1162 from 1258 to get 96.
Fetch the next digit (5) from the dividend, attach it to 96 and continue: 965 / 166

Going ahead to step 5:
The number 166 fits into 965 5 times, leaving a remainder of 135.
Write down 5 as next digit of the result. 
Result so far: 475.0
If we take 830 away from 965, we end up with 135.
Grab the next digit (6) from the dividend, add it to 135, then carry on: 1356 / 166

Advancing to step 6:
166 can be fit into 1356 8 times, resulting in a remainder of 28.
Use 8 as the next digit of our solution. 
Result so far: 4758.0
If we take 1328 away from 1356, we end up with 28.
Append the next digit (2) from the dividend to 28 and continue with: 282 / 166

Step 7:
The number 166 fits into 282 1 times, leaving a remainder of 116.
Record the quotient 1 as the next digit in the result. 
Result so far: 47581.0
If we subtract 166 from 282, we get 116.
Bring next digit (3) of the dividend behind the 116 and repeat the process: 1163 / 166

Step 8:
The number 166 fits into 1163 7 times, leaving a remainder of 1.
The number 7 becomes the next digit in our result. 
Result so far: 475817.0
If we subtract 1162 from 1163, we get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Going ahead to step 9:
When dividing 10 by 166, we get 0 with a remainder of 10.
The number 0 becomes the next digit in our result. 
Result so far: 475817.0
Deduct 0 from 10 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

On to step 10:
166 can be fit into 100 0 times, resulting in a remainder of 100.
Use 0 as the next digit of our solution. 
Result so far: 475817.0
Subtracting 0 from 100 leaves us with 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1000, and continue the process.

The final outcome is 475817.0, with a leftover of 0.1.