8399421 divided by 764 
We're looking to find how many times 764 goes into 8399421.

Let's proceed to step 1:
If we divide 8 by 764, we get 0 and a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 8 after subtracting 0 from 8.
Grab the next digit (3) from the dividend, add it to 8, then carry on: 83 / 764

Advancing to step 2:
When dividing 83 by 764, we get 0 with a remainder of 83.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 83 and we're left with 83.
Append the next digit (9) from the dividend to 83 and continue with: 839 / 764

Let's proceed to step 3:
If we divide 839 by 764, we get 1 and a remainder of 75.
The next digit of our result is 1. 
Result so far: 1.0
The remainder is 75 after subtracting 764 from 839.
Fetch the next digit (9) from the dividend, attach it to 75 and continue: 759 / 764

Going ahead to step 4:
The number 764 fits into 759 0 times, leaving a remainder of 759.
Write down 0 as next digit of the result. 
Result so far: 10.0
Subtract 0 from 759 to get 759.
Fetch the next digit (4) from the dividend, attach it to 759 and continue: 7594 / 764

Moving on to step 5:
When dividing 7594 by 764, we get 9 with a remainder of 718.
Record the quotient 9 as the next digit in the result. 
Result so far: 109.0
Subtract 6876 from 7594 to get 718.
Append the next digit (2) from the dividend to 718 and continue with: 7182 / 764

Step 6:
764 goes into 7182 9 times with a remainder of 306.
Record the quotient 9 as the next digit in the result. 
Result so far: 1099.0
Subtracting 6876 from 7182 leaves us with 306.
Grab the next digit (1) from the dividend, add it to 306, then carry on: 3061 / 764

Step 7:
The number 764 fits into 3061 4 times, leaving a remainder of 5.
Write down 4 as next digit of the result. 
Result so far: 10994.0
If we subtract 3056 from 3061, we 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.

Step 8:
The number 764 fits into 50 0 times, leaving a remainder of 50.
Put 0 as the next digit of the answer. 
Result so far: 10994.0
If we subtract 0 from 50, we get 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

On to step 9:
500 divided by 764 is 0 with a remainder of 500.
Record the quotient 0 as the next digit in the result. 
Result so far: 10994.0
Subtracting 0 from 500 leaves us with 500.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5000, and continue the process.

In conclusion, the division gives 10994.0 with a balance of 0.5.