179646 ÷ 21 
We want to figure out the number of times 179646 can be divided by 21.

Going ahead to step 1:
21 goes into 1 0 times with a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 1 leaves us with 1.
Include the next digit (7) from the dividend after 1, then repeat: 17 / 21

Step 2:
If we divide 17 by 21, we get 0 and a remainder of 17.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 17, we get 17.
Fetch the next digit (9) from the dividend, attach it to 17 and continue: 179 / 21

Going ahead to step 3:
If we divide 179 by 21, we get 8 and a remainder of 11.
The next digit of our result is 8. 
Result so far: 8.0
The remainder is 11 after subtracting 168 from 179.
Take the next digit (6) from the dividend and append it to 11, then repeat: 116 / 21

Going ahead to step 4:
When dividing 116 by 21, we get 5 with a remainder of 11.
The next digit of our result is 5. 
Result so far: 85.0
Subtracting 105 from 116 leaves us with 11.
Include the next digit (4) from the dividend after 11, then repeat: 114 / 21

Advancing to step 5:
114 divided by 21 is 5 with a remainder of 9.
Put 5 as the next digit of the answer. 
Result so far: 855.0
Subtracting 105 from 114 leaves us with 9.
Fetch the next digit (6) from the dividend, attach it to 9 and continue: 96 / 21

Step 6:
When dividing 96 by 21, we get 4 with a remainder of 12.
Write down 4 as next digit of the result. 
Result so far: 8554.0
Subtract 84 from 96 to 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 7:
The number 21 fits into 120 5 times, leaving a remainder of 15.
Write down 5 as next digit of the result. 
Result so far: 8554.5
Subtract 105 from 120 to get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Going ahead to step 8:
21 goes into 150 7 times with a remainder of 3.
Record the quotient 7 as the next digit in the result. 
Result so far: 8554.57
Subtracting 147 from 150 leaves us with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Going ahead to step 9:
21 can be fit into 30 1 times, resulting in a remainder of 9.
Put 1 as the next digit of the answer. 
Result so far: 8554.571
Deduct 21 from 30 and we're left with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Advancing to step 10:
When dividing 90 by 21, we get 4 with a remainder of 6.
Write down 4 as next digit of the result. 
Result so far: 8554.5714
Subtract 84 from 90 to get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Let's proceed to step 11:
21 goes into 60 2 times with a remainder of 18.
The next digit of our result is 2. 
Result so far: 8554.57142
Subtracting 42 from 60 leaves us with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Going ahead to step 12:
21 goes into 180 8 times with a remainder of 12.
Record the quotient 8 as the next digit in the result. 
Result so far: 8554.571428
If we subtract 168 from 180, 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.

Moving on to step 13:
The number 21 fits into 120 5 times, leaving a remainder of 15.
The number 5 becomes the next digit in our result. 
Result so far: 8554.5714285
Subtracting 105 from 120 leaves us with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Advancing to step 14:
21 goes into 150 7 times with a remainder of 3.
Put 7 as the next digit of the answer. 
Result so far: 8554.57142857
Deduct 147 from 150 and we're left with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

The final outcome is 8554.57142857, with a leftover of 3e-09.