We divide 899169 by 21
We want to figure out the number of times 899169 can be divided by 21.

Step 1:
21 can be fit into 8 0 times, resulting in a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Include the next digit (9) from the dividend after 8, then repeat: 89 / 21

Step 2:
When dividing 89 by 21, we get 4 with a remainder of 5.
The number 4 becomes the next digit in our result. 
Result so far: 4.0
Subtract 84 from 89 to get 5.
Take the next digit (9) from the dividend and append it to 5, then repeat: 59 / 21

Advancing to step 3:
21 goes into 59 2 times with a remainder of 17.
Put 2 as the next digit of the answer. 
Result so far: 42.0
If we take 42 away from 59, we end up with 17.
Append the next digit (1) from the dividend to 17 and continue with: 171 / 21

Step 4:
21 can be fit into 171 8 times, resulting in a remainder of 3.
Use 8 as the next digit of our solution. 
Result so far: 428.0
The remainder is 3 after subtracting 168 from 171.
Fetch the next digit (6) from the dividend, attach it to 3 and continue: 36 / 21

On to step 5:
21 goes into 36 1 times with a remainder of 15.
Use 1 as the next digit of our solution. 
Result so far: 4281.0
If we subtract 21 from 36, we get 15.
Bring next digit (9) of the dividend behind the 15 and repeat the process: 159 / 21

Advancing to step 6:
When dividing 159 by 21, we get 7 with a remainder of 12.
Use 7 as the next digit of our solution. 
Result so far: 42817.0
Deduct 147 from 159 and we're left 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.

Moving on to step 7:
21 can be fit into 120 5 times, resulting in a remainder of 15.
Use 5 as the next digit of our solution. 
Result so far: 42817.5
If we take 105 away from 120, we end up 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.

Step 8:
150 divided by 21 is 7 with a remainder of 3.
Record the quotient 7 as the next digit in the result. 
Result so far: 42817.57
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.

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: 42817.571
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.

Step 10:
21 goes into 90 4 times with a remainder of 6.
Write down 4 as next digit of the result. 
Result so far: 42817.5714
Subtracting 84 from 90 leaves us 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.

Moving on to step 11:
21 can be fit into 60 2 times, resulting in a remainder of 18.
Record the quotient 2 as the next digit in the result. 
Result so far: 42817.57142
If we subtract 42 from 60, we get 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Moving on to step 12:
If we divide 180 by 21, we get 8 and a remainder of 12.
Record the quotient 8 as the next digit in the result. 
Result so far: 42817.571428
If we take 168 away from 180, we end up 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 13:
If we divide 120 by 21, we get 5 and a remainder of 15.
Write down 5 as next digit of the result. 
Result so far: 42817.5714285
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.

Advancing to step 14:
21 goes into 150 7 times with a remainder of 3.
The next digit of our result is 7. 
Result so far: 42817.57142857
If we subtract 147 from 150, we get 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 42817.57142857, with a leftover of 3e-09.