Let's divide 436587 by 21
We want to divide 436587 by 21.

Let's proceed to step 1:
21 goes into 4 0 times with a remainder of 4.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 4 leaves us with 4.
Fetch the next digit (3) from the dividend, attach it to 4 and continue: 43 / 21

Advancing to step 2:
When dividing 43 by 21, we get 2 with a remainder of 1.
The next digit of our result is 2. 
Result so far: 2.0
Subtract 42 from 43 to get 1.
Fetch the next digit (6) from the dividend, attach it to 1 and continue: 16 / 21

Advancing to step 3:
16 divided by 21 is 0 with a remainder of 16.
The next digit of our result is 0. 
Result so far: 20.0
If we take 0 away from 16, we end up with 16.
Fetch the next digit (5) from the dividend, attach it to 16 and continue: 165 / 21

Going ahead to step 4:
165 divided by 21 is 7 with a remainder of 18.
The number 7 becomes the next digit in our result. 
Result so far: 207.0
The remainder is 18 after subtracting 147 from 165.
Grab the next digit (8) from the dividend, add it to 18, then carry on: 188 / 21

On to step 5:
When dividing 188 by 21, we get 8 with a remainder of 20.
Use 8 as the next digit of our solution. 
Result so far: 2078.0
Subtract 168 from 188 to get 20.
Include the next digit (7) from the dividend after 20, then repeat: 207 / 21

Step 6:
If we divide 207 by 21, we get 9 and a remainder of 18.
Put 9 as the next digit of the answer. 
Result so far: 20789.0
If we subtract 189 from 207, 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.

Going ahead to step 7:
21 can be fit into 180 8 times, resulting in a remainder of 12.
Write down 8 as next digit of the result. 
Result so far: 20789.8
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.

Let's proceed to step 8:
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: 20789.85
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.

Step 9:
150 divided by 21 is 7 with a remainder of 3.
Write down 7 as next digit of the result. 
Result so far: 20789.857
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.

Let's proceed to step 10:
21 goes into 30 1 times with a remainder of 9.
The number 1 becomes the next digit in our result. 
Result so far: 20789.8571
Subtracting 21 from 30 leaves us 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 11:
21 goes into 90 4 times with a remainder of 6.
Write down 4 as next digit of the result. 
Result so far: 20789.85714
The remainder is 6 after subtracting 84 from 90.
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 12:
The number 21 fits into 60 2 times, leaving a remainder of 18.
Put 2 as the next digit of the answer. 
Result so far: 20789.857142
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.

Going ahead to step 13:
21 can be fit into 180 8 times, resulting in a remainder of 12.
Put 8 as the next digit of the answer. 
Result so far: 20789.8571428
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.

Going ahead to step 14:
If we divide 120 by 21, we get 5 and a remainder of 15.
Use 5 as the next digit of our solution. 
Result so far: 20789.85714285
Deduct 105 from 120 and we're left 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.

The final result is 20789.85714285 with a remainder of 1.5e-08.