521429 divided by 8 
Let's see how many times 8 fits into 521429.

Let's proceed to step 1:
8 goes into 5 0 times with a remainder of 5.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 5, we get 5.
Take the next digit (2) from the dividend and append it to 5, then repeat: 52 / 8

Going ahead to step 2:
If we divide 52 by 8, we get 6 and a remainder of 4.
Put 6 as the next digit of the answer. 
Result so far: 6.0
If we take 48 away from 52, we end up with 4.
Bring next digit (1) of the dividend behind the 4 and repeat the process: 41 / 8

Step 3:
The number 8 fits into 41 5 times, leaving a remainder of 1.
Record the quotient 5 as the next digit in the result. 
Result so far: 65.0
If we subtract 40 from 41, we get 1.
Grab the next digit (4) from the dividend, add it to 1, then carry on: 14 / 8

Moving on to step 4:
When dividing 14 by 8, we get 1 with a remainder of 6.
The number 1 becomes the next digit in our result. 
Result so far: 651.0
Subtract 8 from 14 to get 6.
Include the next digit (2) from the dividend after 6, then repeat: 62 / 8

Step 5:
62 divided by 8 is 7 with a remainder of 6.
Record the quotient 7 as the next digit in the result. 
Result so far: 6517.0
The remainder is 6 after subtracting 56 from 62.
Append the next digit (9) from the dividend to 6 and continue with: 69 / 8

Let's proceed to step 6:
69 divided by 8 is 8 with a remainder of 5.
Write down 8 as next digit of the result. 
Result so far: 65178.0
Subtract 64 from 69 to get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Going ahead to step 7:
8 goes into 50 6 times with a remainder of 2.
The number 6 becomes the next digit in our result. 
Result so far: 65178.6
Subtract 48 from 50 to get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Advancing to step 8:
If we divide 20 by 8, we get 2 and a remainder of 4.
Use 2 as the next digit of our solution. 
Result so far: 65178.62
Subtracting 16 from 20 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.

Let's proceed to step 9:
When dividing 40 by 8, we get 5 with a remainder of 0.
The number 5 becomes the next digit in our result. 
Result so far: 65178.625
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.

Step 10:
When dividing 0 by 8, we get 0 with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 65178.625
Deduct 0 from 0 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.

Going ahead to step 11:
8 can be fit into 0 0 times, resulting in a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 65178.625
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.

After the division, we end up with 65178.625 and a remainder of 0.0.