Let's divide 174879 by 21
We're looking to find how many times 21 goes into 174879.

Step 1:
21 can be fit into 1 0 times, resulting in a remainder of 1.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Bring next digit (7) of the dividend behind the 1 and repeat the process: 17 / 21

Let's proceed to step 2:
The number 21 fits into 17 0 times, leaving a remainder of 17.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 17, we get 17.
Include the next digit (4) from the dividend after 17, then repeat: 174 / 21

Moving on to step 3:
When dividing 174 by 21, we get 8 with a remainder of 6.
The number 8 becomes the next digit in our result. 
Result so far: 8.0
If we subtract 168 from 174, we get 6.
Append the next digit (8) from the dividend to 6 and continue with: 68 / 21

Let's proceed to step 4:
68 divided by 21 is 3 with a remainder of 5.
Put 3 as the next digit of the answer. 
Result so far: 83.0
Deduct 63 from 68 and we're left with 5.
Fetch the next digit (7) from the dividend, attach it to 5 and continue: 57 / 21

On to step 5:
21 goes into 57 2 times with a remainder of 15.
Put 2 as the next digit of the answer. 
Result so far: 832.0
Subtract 42 from 57 to get 15.
Fetch the next digit (9) from the dividend, attach it to 15 and continue: 159 / 21

Step 6:
21 can be fit into 159 7 times, resulting in a remainder of 12.
Use 7 as the next digit of our solution. 
Result so far: 8327.0
Subtracting 147 from 159 leaves us with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Let's proceed to step 7:
The number 21 fits into 120 5 times, leaving a remainder of 15.
Record the quotient 5 as the next digit in the result. 
Result so far: 8327.5
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.

Step 8:
150 divided by 21 is 7 with a remainder of 3.
Write down 7 as next digit of the result. 
Result so far: 8327.57
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.

On to step 9:
21 can be fit into 30 1 times, resulting in a remainder of 9.
The next digit of our result is 1. 
Result so far: 8327.571
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.

Moving on to step 10:
21 goes into 90 4 times with a remainder of 6.
The number 4 becomes the next digit in our result. 
Result so far: 8327.5714
Deduct 84 from 90 and we're left with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

On to step 11:
60 divided by 21 is 2 with a remainder of 18.
Put 2 as the next digit of the answer. 
Result so far: 8327.57142
If we take 42 away from 60, we end up 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:
180 divided by 21 is 8 with a remainder of 12.
Write down 8 as next digit of the result. 
Result so far: 8327.571428
Subtracting 168 from 180 leaves us with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Advancing to step 13:
When dividing 120 by 21, we get 5 with a remainder of 15.
Use 5 as the next digit of our solution. 
Result so far: 8327.5714285
If we subtract 105 from 120, we 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 14:
21 can be fit into 150 7 times, resulting in a remainder of 3.
Put 7 as the next digit of the answer. 
Result so far: 8327.57142857
If we take 147 away from 150, we end up 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.

After the division, we end up with 8327.57142857 and a remainder of 3e-09.