We divide 64386190 by 321
Our goal is to divide 64386190 by 321.

On to step 1:
When dividing 6 by 321, we get 0 with a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 6 and we're left with 6.
Append the next digit (4) from the dividend to 6 and continue with: 64 / 321

On to step 2:
64 divided by 321 is 0 with a remainder of 64.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 64 and we're left with 64.
Bring next digit (3) of the dividend behind the 64 and repeat the process: 643 / 321

On to step 3:
321 can be fit into 643 2 times, resulting in a remainder of 1.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
Subtracting 642 from 643 leaves us with 1.
Take the next digit (8) from the dividend and append it to 1, then repeat: 18 / 321

Moving on to step 4:
18 divided by 321 is 0 with a remainder of 18.
Use 0 as the next digit of our solution. 
Result so far: 20.0
Subtract 0 from 18 to get 18.
Bring next digit (6) of the dividend behind the 18 and repeat the process: 186 / 321

Let's proceed to step 5:
When dividing 186 by 321, we get 0 with a remainder of 186.
The number 0 becomes the next digit in our result. 
Result so far: 200.0
The remainder is 186 after subtracting 0 from 186.
Bring next digit (1) of the dividend behind the 186 and repeat the process: 1861 / 321

Moving on to step 6:
The number 321 fits into 1861 5 times, leaving a remainder of 256.
The number 5 becomes the next digit in our result. 
Result so far: 2005.0
Subtract 1605 from 1861 to get 256.
Take the next digit (9) from the dividend and append it to 256, then repeat: 2569 / 321

Going ahead to step 7:
321 can be fit into 2569 8 times, resulting in a remainder of 1.
Put 8 as the next digit of the answer. 
Result so far: 20058.0
Subtracting 2568 from 2569 leaves us with 1.
Grab the next digit (0) from the dividend, add it to 1, then carry on: 10 / 321

Going ahead to step 8:
When dividing 10 by 321, we get 0 with a remainder of 10.
Use 0 as the next digit of our solution. 
Result so far: 200580.0
Deduct 0 from 10 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

On to step 9:
When dividing 100 by 321, we get 0 with a remainder of 100.
Write down 0 as next digit of the result. 
Result so far: 200580.0
If we subtract 0 from 100, we get 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1000, and continue the process.

Step 10:
321 goes into 1000 3 times with a remainder of 37.
Put 3 as the next digit of the answer. 
Result so far: 200580.03
The remainder is 37 after subtracting 963 from 1000.
Since there are no more digits in the dividend, we add a zero to the remainder making it 370, and continue the process.

Let's proceed to step 11:
321 can be fit into 370 1 times, resulting in a remainder of 49.
Record the quotient 1 as the next digit in the result. 
Result so far: 200580.031
Deduct 321 from 370 and we're left with 49.
Since there are no more digits in the dividend, we add a zero to the remainder making it 490, and continue the process.

On to step 12:
When dividing 490 by 321, we get 1 with a remainder of 169.
Write down 1 as next digit of the result. 
Result so far: 200580.0311
The remainder is 169 after subtracting 321 from 490.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1690, and continue the process.

In conclusion, the division gives 200580.0311 with a balance of 0.00169.