Let's divide 874459 by 21
We want to divide 874459 by 21.

Advancing to step 1:
The number 21 fits into 8 0 times, leaving a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Grab the next digit (7) from the dividend, add it to 8, then carry on: 87 / 21

Let's proceed to step 2:
The number 21 fits into 87 4 times, leaving a remainder of 3.
The next digit of our result is 4. 
Result so far: 4.0
Subtract 84 from 87 to get 3.
Take the next digit (4) from the dividend and append it to 3, then repeat: 34 / 21

Let's proceed to step 3:
21 can be fit into 34 1 times, resulting in a remainder of 13.
The number 1 becomes the next digit in our result. 
Result so far: 41.0
Subtract 21 from 34 to get 13.
Include the next digit (4) from the dividend after 13, then repeat: 134 / 21

Let's proceed to step 4:
When dividing 134 by 21, we get 6 with a remainder of 8.
Put 6 as the next digit of the answer. 
Result so far: 416.0
Subtract 126 from 134 to get 8.
Fetch the next digit (5) from the dividend, attach it to 8 and continue: 85 / 21

Step 5:
When dividing 85 by 21, we get 4 with a remainder of 1.
The number 4 becomes the next digit in our result. 
Result so far: 4164.0
If we subtract 84 from 85, we get 1.
Grab the next digit (9) from the dividend, add it to 1, then carry on: 19 / 21

On to step 6:
If we divide 19 by 21, we get 0 and a remainder of 19.
Record the quotient 0 as the next digit in the result. 
Result so far: 41640.0
Subtract 0 from 19 to get 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Moving on to step 7:
190 divided by 21 is 9 with a remainder of 1.
Write down 9 as next digit of the result. 
Result so far: 41640.9
If we subtract 189 from 190, we get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Moving on to step 8:
21 can be fit into 10 0 times, resulting in a remainder of 10.
The next digit of our result is 0. 
Result so far: 41640.9
Deduct 0 from 10 and we're left 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.

On to step 9:
100 divided by 21 is 4 with a remainder of 16.
The number 4 becomes the next digit in our result. 
Result so far: 41640.904
Subtract 84 from 100 to get 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 10:
The number 21 fits into 160 7 times, leaving a remainder of 13.
The number 7 becomes the next digit in our result. 
Result so far: 41640.9047
If we subtract 147 from 160, we get 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Step 11:
The number 21 fits into 130 6 times, leaving a remainder of 4.
Use 6 as the next digit of our solution. 
Result so far: 41640.90476
Deduct 126 from 130 and we're left with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Moving on to step 12:
If we divide 40 by 21, we get 1 and a remainder of 19.
Record the quotient 1 as the next digit in the result. 
Result so far: 41640.904761
Deduct 21 from 40 and we're left 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 13:
190 divided by 21 is 9 with a remainder of 1.
Use 9 as the next digit of our solution. 
Result so far: 41640.9047619
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.

Step 14:
If we divide 10 by 21, we get 0 and a remainder of 10.
The number 0 becomes the next digit in our result. 
Result so far: 41640.9047619
Subtracting 0 from 10 leaves us 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.

The final outcome is 41640.9047619, with a leftover of 1e-08.