166921 divided by 86 
We want to figure out the number of times 166921 can be divided by 86.

Moving on to step 1:
1 divided by 86 is 0 with a remainder of 1.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 1 to get 1.
Grab the next digit (6) from the dividend, add it to 1, then carry on: 16 / 86

On to step 2:
16 divided by 86 is 0 with a remainder of 16.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 16, we end up with 16.
Take the next digit (6) from the dividend and append it to 16, then repeat: 166 / 86

Advancing to step 3:
The number 86 fits into 166 1 times, leaving a remainder of 80.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Subtract 86 from 166 to get 80.
Fetch the next digit (9) from the dividend, attach it to 80 and continue: 809 / 86

Step 4:
The number 86 fits into 809 9 times, leaving a remainder of 35.
Use 9 as the next digit of our solution. 
Result so far: 19.0
The remainder is 35 after subtracting 774 from 809.
Bring next digit (2) of the dividend behind the 35 and repeat the process: 352 / 86

Let's proceed to step 5:
86 can be fit into 352 4 times, resulting in a remainder of 8.
Record the quotient 4 as the next digit in the result. 
Result so far: 194.0
Subtracting 344 from 352 leaves us with 8.
Fetch the next digit (1) from the dividend, attach it to 8 and continue: 81 / 86

Let's proceed to step 6:
If we divide 81 by 86, we get 0 and a remainder of 81.
The next digit of our result is 0. 
Result so far: 1940.0
The remainder is 81 after subtracting 0 from 81.
Since there are no more digits in the dividend, we add a zero to the remainder making it 810, and continue the process.

Moving on to step 7:
810 divided by 86 is 9 with a remainder of 36.
The next digit of our result is 9. 
Result so far: 1940.9
If we subtract 774 from 810, we get 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Step 8:
360 divided by 86 is 4 with a remainder of 16.
Record the quotient 4 as the next digit in the result. 
Result so far: 1940.94
Deduct 344 from 360 and we're left with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Let's proceed to step 9:
When dividing 160 by 86, we get 1 with a remainder of 74.
Put 1 as the next digit of the answer. 
Result so far: 1940.941
Subtract 86 from 160 to get 74.
Since there are no more digits in the dividend, we add a zero to the remainder making it 740, and continue the process.

Going ahead to step 10:
When dividing 740 by 86, we get 8 with a remainder of 52.
The number 8 becomes the next digit in our result. 
Result so far: 1940.9418
Subtract 688 from 740 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.

Going ahead to step 11:
When dividing 520 by 86, we get 6 with a remainder of 4.
The next digit of our result is 6. 
Result so far: 1940.94186
Subtract 516 from 520 to get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

On to step 12:
The number 86 fits into 40 0 times, leaving a remainder of 40.
Write down 0 as next digit of the result. 
Result so far: 1940.94186
If we take 0 away from 40, we end up with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

On to step 13:
If we divide 400 by 86, we get 4 and a remainder of 56.
Write down 4 as next digit of the result. 
Result so far: 1940.9418604
Subtracting 344 from 400 leaves us with 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

Step 14:
560 divided by 86 is 6 with a remainder of 44.
Put 6 as the next digit of the answer. 
Result so far: 1940.94186046
If we take 516 away from 560, we end up with 44.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

In conclusion, the division gives 1940.94186046 with a balance of 4.4e-08.