64394609 ÷ 809 
Our goal is to divide 64394609 by 809.

Step 1:
809 goes into 6 0 times with a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Include the next digit (4) from the dividend after 6, then repeat: 64 / 809

On to step 2:
809 goes into 64 0 times with a remainder of 64.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 64 to get 64.
Append the next digit (3) from the dividend to 64 and continue with: 643 / 809

Step 3:
809 goes into 643 0 times with a remainder of 643.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 643, we end up with 643.
Append the next digit (9) from the dividend to 643 and continue with: 6439 / 809

Moving on to step 4:
6439 divided by 809 is 7 with a remainder of 776.
Use 7 as the next digit of our solution. 
Result so far: 7.0
Subtracting 5663 from 6439 leaves us with 776.
Append the next digit (4) from the dividend to 776 and continue with: 7764 / 809

Going ahead to step 5:
The number 809 fits into 7764 9 times, leaving a remainder of 483.
Put 9 as the next digit of the answer. 
Result so far: 79.0
Subtract 7281 from 7764 to get 483.
Include the next digit (6) from the dividend after 483, then repeat: 4836 / 809

On to step 6:
When dividing 4836 by 809, we get 5 with a remainder of 791.
The number 5 becomes the next digit in our result. 
Result so far: 795.0
The remainder is 791 after subtracting 4045 from 4836.
Grab the next digit (0) from the dividend, add it to 791, then carry on: 7910 / 809

Let's proceed to step 7:
The number 809 fits into 7910 9 times, leaving a remainder of 629.
Write down 9 as next digit of the result. 
Result so far: 7959.0
Subtract 7281 from 7910 to get 629.
Include the next digit (9) from the dividend after 629, then repeat: 6299 / 809

Going ahead to step 8:
The number 809 fits into 6299 7 times, leaving a remainder of 636.
Use 7 as the next digit of our solution. 
Result so far: 79597.0
Deduct 5663 from 6299 and we're left with 636.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6360, and continue the process.

Moving on to step 9:
The number 809 fits into 6360 7 times, leaving a remainder of 697.
Write down 7 as next digit of the result. 
Result so far: 79597.7
If we take 5663 away from 6360, we end up with 697.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6970, and continue the process.

Advancing to step 10:
If we divide 6970 by 809, we get 8 and a remainder of 498.
Record the quotient 8 as the next digit in the result. 
Result so far: 79597.78
The remainder is 498 after subtracting 6472 from 6970.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4980, and continue the process.

On to step 11:
4980 divided by 809 is 6 with a remainder of 126.
The next digit of our result is 6. 
Result so far: 79597.786
Deduct 4854 from 4980 and we're left with 126.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1260, and continue the process.

Going ahead to step 12:
If we divide 1260 by 809, we get 1 and a remainder of 451.
The next digit of our result is 1. 
Result so far: 79597.7861
Subtracting 809 from 1260 leaves us with 451.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4510, and continue the process.

On to step 13:
809 goes into 4510 5 times with a remainder of 465.
Use 5 as the next digit of our solution. 
Result so far: 79597.78615
The remainder is 465 after subtracting 4045 from 4510.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4650, and continue the process.

Moving on to step 14:
If we divide 4650 by 809, we get 5 and a remainder of 605.
Write down 5 as next digit of the result. 
Result so far: 79597.786155
If we take 4045 away from 4650, we end up with 605.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6050, and continue the process.

The final result is 79597.786155 with a remainder of 6.05e-05.