We look at the division of 286435 by 21 
We want to divide 286435 by 21.

Let's proceed to step 1:
21 can be fit into 2 0 times, resulting in a remainder of 2.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 2 after subtracting 0 from 2.
Fetch the next digit (8) from the dividend, attach it to 2 and continue: 28 / 21

Going ahead to step 2:
If we divide 28 by 21, we get 1 and a remainder of 7.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Subtract 21 from 28 to get 7.
Include the next digit (6) from the dividend after 7, then repeat: 76 / 21

Going ahead to step 3:
If we divide 76 by 21, we get 3 and a remainder of 13.
Put 3 as the next digit of the answer. 
Result so far: 13.0
If we subtract 63 from 76, we get 13.
Take the next digit (4) from the dividend and append it to 13, then repeat: 134 / 21

Let's proceed to step 4:
When dividing 134 by 21, we get 6 with a remainder of 8.
The number 6 becomes the next digit in our result. 
Result so far: 136.0
Subtract 126 from 134 to get 8.
Grab the next digit (3) from the dividend, add it to 8, then carry on: 83 / 21

Let's proceed to step 5:
21 can be fit into 83 3 times, resulting in a remainder of 20.
Write down 3 as next digit of the result. 
Result so far: 1363.0
If we take 63 away from 83, we end up with 20.
Fetch the next digit (5) from the dividend, attach it to 20 and continue: 205 / 21

Moving on to step 6:
205 divided by 21 is 9 with a remainder of 16.
Write down 9 as next digit of the result. 
Result so far: 13639.0
Subtract 189 from 205 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.

On to step 7:
When dividing 160 by 21, we get 7 with a remainder of 13.
Put 7 as the next digit of the answer. 
Result so far: 13639.7
Deduct 147 from 160 and we're left 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.

Moving on to step 8:
21 can be fit into 130 6 times, resulting in a remainder of 4.
Write down 6 as next digit of the result. 
Result so far: 13639.76
Subtracting 126 from 130 leaves us 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.

Step 9:
21 goes into 40 1 times with a remainder of 19.
The next digit of our result is 1. 
Result so far: 13639.761
Subtract 21 from 40 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.

Going ahead to step 10:
When dividing 190 by 21, we get 9 with a remainder of 1.
The number 9 becomes the next digit in our result. 
Result so far: 13639.7619
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.

On to step 11:
21 goes into 10 0 times with a remainder of 10.
The number 0 becomes the next digit in our result. 
Result so far: 13639.7619
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.

Going ahead to step 12:
The number 21 fits into 100 4 times, leaving a remainder of 16.
Write down 4 as next digit of the result. 
Result so far: 13639.761904
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.

Going ahead to step 13:
21 goes into 160 7 times with a remainder of 13.
Use 7 as the next digit of our solution. 
Result so far: 13639.7619047
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.

Moving on to step 14:
If we divide 130 by 21, we get 6 and a remainder of 4.
Put 6 as the next digit of the answer. 
Result so far: 13639.76190476
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.

Our division results in 13639.76190476 with a remaining 4e-09.