We're dividing 448771 by 21 
We're looking to find how many times 21 goes into 448771.

On to step 1:
If we divide 4 by 21, we get 0 and a remainder of 4.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 4, we end up with 4.
Fetch the next digit (4) from the dividend, attach it to 4 and continue: 44 / 21

On to step 2:
If we divide 44 by 21, we get 2 and a remainder of 2.
Put 2 as the next digit of the answer. 
Result so far: 2.0
If we take 42 away from 44, we end up with 2.
Take the next digit (8) from the dividend and append it to 2, then repeat: 28 / 21

Advancing to step 3:
When dividing 28 by 21, we get 1 with a remainder of 7.
The number 1 becomes the next digit in our result. 
Result so far: 21.0
If we subtract 21 from 28, we get 7.
Take the next digit (7) from the dividend and append it to 7, then repeat: 77 / 21

Going ahead to step 4:
If we divide 77 by 21, we get 3 and a remainder of 14.
Put 3 as the next digit of the answer. 
Result so far: 213.0
Subtract 63 from 77 to get 14.
Grab the next digit (7) from the dividend, add it to 14, then carry on: 147 / 21

Advancing to step 5:
21 can be fit into 147 7 times, resulting in a remainder of 0.
Record the quotient 7 as the next digit in the result. 
Result so far: 2137.0
Subtract 147 from 147 to get 0.
Bring next digit (1) of the dividend behind the 0 and repeat the process: 1 / 21

Let's proceed to step 6:
21 goes into 1 0 times with a remainder of 1.
Put 0 as the next digit of the answer. 
Result so far: 21370.0
The remainder is 1 after subtracting 0 from 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Advancing to step 7:
When dividing 10 by 21, we get 0 with a remainder of 10.
Use 0 as the next digit of our solution. 
Result so far: 21370.0
Subtract 0 from 10 to get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Step 8:
21 can be fit into 100 4 times, resulting in a remainder of 16.
Record the quotient 4 as the next digit in the result. 
Result so far: 21370.04
If we take 84 away from 100, we end up 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.

Step 9:
21 goes into 160 7 times with a remainder of 13.
The next digit of our result is 7. 
Result so far: 21370.047
Subtracting 147 from 160 leaves us with 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

On to step 10:
130 divided by 21 is 6 with a remainder of 4.
Write down 6 as next digit of the result. 
Result so far: 21370.0476
Subtract 126 from 130 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.

Advancing to step 11:
21 can be fit into 40 1 times, resulting in a remainder of 19.
Write down 1 as next digit of the result. 
Result so far: 21370.04761
Subtracting 21 from 40 leaves us with 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

On to step 12:
190 divided by 21 is 9 with a remainder of 1.
Write down 9 as next digit of the result. 
Result so far: 21370.047619
Deduct 189 from 190 and we're left with 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 13:
When dividing 10 by 21, we get 0 with a remainder of 10.
The number 0 becomes the next digit in our result. 
Result so far: 21370.047619
If we take 0 away from 10, we end up 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.

Step 14:
21 goes into 100 4 times with a remainder of 16.
The next digit of our result is 4. 
Result so far: 21370.04761904
The remainder is 16 after subtracting 84 from 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

After the division, we end up with 21370.04761904 and a remainder of 1.6e-08.