We look at the division of 646329 by 86 
We want to figure out the number of times 646329 can be divided by 86.

Moving on to step 1:
86 goes into 6 0 times with a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 6 and we're left with 6.
Fetch the next digit (4) from the dividend, attach it to 6 and continue: 64 / 86

Moving on to step 2:
86 goes into 64 0 times with a remainder of 64.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 64 leaves us with 64.
Append the next digit (6) from the dividend to 64 and continue with: 646 / 86

Advancing to step 3:
86 can be fit into 646 7 times, resulting in a remainder of 44.
Write down 7 as next digit of the result. 
Result so far: 7.0
Subtracting 602 from 646 leaves us with 44.
Include the next digit (3) from the dividend after 44, then repeat: 443 / 86

Going ahead to step 4:
86 goes into 443 5 times with a remainder of 13.
The next digit of our result is 5. 
Result so far: 75.0
Deduct 430 from 443 and we're left with 13.
Append the next digit (2) from the dividend to 13 and continue with: 132 / 86

Advancing to step 5:
The number 86 fits into 132 1 times, leaving a remainder of 46.
The number 1 becomes the next digit in our result. 
Result so far: 751.0
The remainder is 46 after subtracting 86 from 132.
Grab the next digit (9) from the dividend, add it to 46, then carry on: 469 / 86

Let's proceed to step 6:
86 can be fit into 469 5 times, resulting in a remainder of 39.
Put 5 as the next digit of the answer. 
Result so far: 7515.0
Deduct 430 from 469 and we're left with 39.
Since there are no more digits in the dividend, we add a zero to the remainder making it 390, and continue the process.

Step 7:
86 goes into 390 4 times with a remainder of 46.
Record the quotient 4 as the next digit in the result. 
Result so far: 7515.4
If we subtract 344 from 390, we get 46.
Since there are no more digits in the dividend, we add a zero to the remainder making it 460, and continue the process.

Moving on to step 8:
If we divide 460 by 86, we get 5 and a remainder of 30.
The number 5 becomes the next digit in our result. 
Result so far: 7515.45
If we subtract 430 from 460, we get 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Step 9:
The number 86 fits into 300 3 times, leaving a remainder of 42.
Record the quotient 3 as the next digit in the result. 
Result so far: 7515.453
The remainder is 42 after subtracting 258 from 300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 420, and continue the process.

Moving on to step 10:
When dividing 420 by 86, we get 4 with a remainder of 76.
The number 4 becomes the next digit in our result. 
Result so far: 7515.4534
Subtract 344 from 420 to get 76.
Since there are no more digits in the dividend, we add a zero to the remainder making it 760, and continue the process.

Advancing to step 11:
If we divide 760 by 86, we get 8 and a remainder of 72.
Put 8 as the next digit of the answer. 
Result so far: 7515.45348
If we take 688 away from 760, we end up with 72.
Since there are no more digits in the dividend, we add a zero to the remainder making it 720, and continue the process.

Advancing to step 12:
86 goes into 720 8 times with a remainder of 32.
The number 8 becomes the next digit in our result. 
Result so far: 7515.453488
The remainder is 32 after subtracting 688 from 720.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

In conclusion, the division gives 7515.453488 with a balance of 3.2e-06.