We look at the division of 643315 by 77 
We want to divide 643315 by 77.

Going ahead to step 1:
77 can be fit into 6 0 times, resulting in a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 6 after subtracting 0 from 6.
Take the next digit (4) from the dividend and append it to 6, then repeat: 64 / 77

Going ahead to step 2:
When dividing 64 by 77, we get 0 with a remainder of 64.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 64 leaves us with 64.
Append the next digit (3) from the dividend to 64 and continue with: 643 / 77

On to step 3:
643 divided by 77 is 8 with a remainder of 27.
The number 8 becomes the next digit in our result. 
Result so far: 8.0
If we subtract 616 from 643, we get 27.
Grab the next digit (3) from the dividend, add it to 27, then carry on: 273 / 77

Step 4:
When dividing 273 by 77, we get 3 with a remainder of 42.
Write down 3 as next digit of the result. 
Result so far: 83.0
Subtract 231 from 273 to get 42.
Take the next digit (1) from the dividend and append it to 42, then repeat: 421 / 77

Let's proceed to step 5:
77 goes into 421 5 times with a remainder of 36.
The number 5 becomes the next digit in our result. 
Result so far: 835.0
Deduct 385 from 421 and we're left with 36.
Take the next digit (5) from the dividend and append it to 36, then repeat: 365 / 77

Advancing to step 6:
When dividing 365 by 77, we get 4 with a remainder of 57.
Put 4 as the next digit of the answer. 
Result so far: 8354.0
If we subtract 308 from 365, we get 57.
Since there are no more digits in the dividend, we add a zero to the remainder making it 570, and continue the process.

Step 7:
77 goes into 570 7 times with a remainder of 31.
The number 7 becomes the next digit in our result. 
Result so far: 8354.7
If we take 539 away from 570, we end up with 31.
Since there are no more digits in the dividend, we add a zero to the remainder making it 310, and continue the process.

Going ahead to step 8:
When dividing 310 by 77, we get 4 with a remainder of 2.
Use 4 as the next digit of our solution. 
Result so far: 8354.74
The remainder is 2 after subtracting 308 from 310.
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 9:
The number 77 fits into 20 0 times, leaving a remainder of 20.
Use 0 as the next digit of our solution. 
Result so far: 8354.74
Subtracting 0 from 20 leaves us with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Advancing to step 10:
The number 77 fits into 200 2 times, leaving a remainder of 46.
Record the quotient 2 as the next digit in the result. 
Result so far: 8354.7402
Subtract 154 from 200 to 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.

Let's proceed to step 11:
The number 77 fits into 460 5 times, leaving a remainder of 75.
Use 5 as the next digit of our solution. 
Result so far: 8354.74025
Subtracting 385 from 460 leaves us with 75.
Since there are no more digits in the dividend, we add a zero to the remainder making it 750, and continue the process.

Advancing to step 12:
77 goes into 750 9 times with a remainder of 57.
The next digit of our result is 9. 
Result so far: 8354.740259
If we take 693 away from 750, we end up with 57.
Since there are no more digits in the dividend, we add a zero to the remainder making it 570, and continue the process.

Advancing to step 13:
77 can be fit into 570 7 times, resulting in a remainder of 31.
Write down 7 as next digit of the result. 
Result so far: 8354.7402597
Subtract 539 from 570 to get 31.
Since there are no more digits in the dividend, we add a zero to the remainder making it 310, and continue the process.

Moving on to step 14:
When dividing 310 by 77, we get 4 with a remainder of 2.
The next digit of our result is 4. 
Result so far: 8354.74025974
If we subtract 308 from 310, we 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.

The final result is 8354.74025974 with a remainder of 2e-09.