We look at the division of 421507 by 8 
We want to divide 421507 by 8.

Moving on to step 1:
4 divided by 8 is 0 with a remainder of 4.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 4, we get 4.
Grab the next digit (2) from the dividend, add it to 4, then carry on: 42 / 8

Going ahead to step 2:
8 goes into 42 5 times with a remainder of 2.
Write down 5 as next digit of the result. 
Result so far: 5.0
Deduct 40 from 42 and we're left with 2.
Fetch the next digit (1) from the dividend, attach it to 2 and continue: 21 / 8

Advancing to step 3:
8 can be fit into 21 2 times, resulting in a remainder of 5.
Use 2 as the next digit of our solution. 
Result so far: 52.0
If we subtract 16 from 21, we get 5.
Take the next digit (5) from the dividend and append it to 5, then repeat: 55 / 8

Going ahead to step 4:
When dividing 55 by 8, we get 6 with a remainder of 7.
The number 6 becomes the next digit in our result. 
Result so far: 526.0
If we take 48 away from 55, we end up with 7.
Include the next digit (0) from the dividend after 7, then repeat: 70 / 8

Going ahead to step 5:
8 goes into 70 8 times with a remainder of 6.
Put 8 as the next digit of the answer. 
Result so far: 5268.0
If we subtract 64 from 70, we get 6.
Append the next digit (7) from the dividend to 6 and continue with: 67 / 8

On to step 6:
8 goes into 67 8 times with a remainder of 3.
Write down 8 as next digit of the result. 
Result so far: 52688.0
If we subtract 64 from 67, 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.

Going ahead to step 7:
8 goes into 30 3 times with a remainder of 6.
The next digit of our result is 3. 
Result so far: 52688.3
Subtracting 24 from 30 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.

Advancing to step 8:
When dividing 60 by 8, we get 7 with a remainder of 4.
Record the quotient 7 as the next digit in the result. 
Result so far: 52688.37
The remainder is 4 after subtracting 56 from 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Advancing to step 9:
If we divide 40 by 8, we get 5 and a remainder of 0.
Use 5 as the next digit of our solution. 
Result so far: 52688.375
Deduct 40 from 40 and we're left 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.

Let's proceed to step 10:
If we divide 0 by 8, we get 0 and a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 52688.375
Subtracting 0 from 0 leaves us 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.

Step 11:
8 can be fit into 0 0 times, resulting in a remainder of 0.
The next digit of our result is 0. 
Result so far: 52688.375
Subtract 0 from 0 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.

Our division results in 52688.375 with a remaining 0.0.