We're dividing 421535 by 2 
We're looking to find how many times 2 goes into 421535.

Advancing to step 1:
4 divided by 2 is 2 with a remainder of 0.
The next digit of our result is 2. 
Result so far: 2.0
If we take 4 away from 4, we end up with 0.
Grab the next digit (2) from the dividend, add it to 0, then carry on: 2 / 2

Let's proceed to step 2:
The number 2 fits into 2 1 times, leaving a remainder of 0.
The number 1 becomes the next digit in our result. 
Result so far: 21.0
The remainder is 0 after subtracting 2 from 2.
Fetch the next digit (1) from the dividend, attach it to 0 and continue: 1 / 2

Going ahead to step 3:
The number 2 fits into 1 0 times, leaving a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 210.0
Subtracting 0 from 1 leaves us with 1.
Append the next digit (5) from the dividend to 1 and continue with: 15 / 2

Going ahead to step 4:
The number 2 fits into 15 7 times, leaving a remainder of 1.
Record the quotient 7 as the next digit in the result. 
Result so far: 2107.0
Subtract 14 from 15 to get 1.
Take the next digit (3) from the dividend and append it to 1, then repeat: 13 / 2

Let's proceed to step 5:
2 can be fit into 13 6 times, resulting in a remainder of 1.
Put 6 as the next digit of the answer. 
Result so far: 21076.0
The remainder is 1 after subtracting 12 from 13.
Bring next digit (5) of the dividend behind the 1 and repeat the process: 15 / 2

Moving on to step 6:
If we divide 15 by 2, we get 7 and a remainder of 1.
Record the quotient 7 as the next digit in the result. 
Result so far: 210767.0
If we subtract 14 from 15, 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.

Step 7:
10 divided by 2 is 5 with a remainder of 0.
Use 5 as the next digit of our solution. 
Result so far: 210767.5
Subtract 10 from 10 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

On to step 8:
When dividing 0 by 2, we get 0 with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 210767.5
If we take 0 away from 0, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 9:
If we divide 0 by 2, we get 0 and a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 210767.5
If we subtract 0 from 0, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final result is 210767.5 with a remainder of 0.0.