We divide 644513 by 77
We want to divide 644513 by 77.

Let's proceed to step 1:
If we divide 6 by 77, we get 0 and 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 / 77

On to step 2:
64 divided by 77 is 0 with a remainder of 64.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 64, we end up with 64.
Append the next digit (4) from the dividend to 64 and continue with: 644 / 77

Moving on to step 3:
77 can be fit into 644 8 times, resulting in a remainder of 28.
Put 8 as the next digit of the answer. 
Result so far: 8.0
Subtracting 616 from 644 leaves us with 28.
Bring next digit (5) of the dividend behind the 28 and repeat the process: 285 / 77

Let's proceed to step 4:
77 can be fit into 285 3 times, resulting in a remainder of 54.
Use 3 as the next digit of our solution. 
Result so far: 83.0
If we take 231 away from 285, we end up with 54.
Append the next digit (1) from the dividend to 54 and continue with: 541 / 77

Moving on to step 5:
When dividing 541 by 77, we get 7 with a remainder of 2.
Use 7 as the next digit of our solution. 
Result so far: 837.0
If we take 539 away from 541, we end up with 2.
Fetch the next digit (3) from the dividend, attach it to 2 and continue: 23 / 77

Step 6:
23 divided by 77 is 0 with a remainder of 23.
Use 0 as the next digit of our solution. 
Result so far: 8370.0
If we take 0 away from 23, we end up with 23.
Since there are no more digits in the dividend, we add a zero to the remainder making it 230, and continue the process.

Moving on to step 7:
If we divide 230 by 77, we get 2 and a remainder of 76.
Write down 2 as next digit of the result. 
Result so far: 8370.2
Subtracting 154 from 230 leaves us with 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 8:
77 goes into 760 9 times with a remainder of 67.
Record the quotient 9 as the next digit in the result. 
Result so far: 8370.29
Subtract 693 from 760 to get 67.
Since there are no more digits in the dividend, we add a zero to the remainder making it 670, and continue the process.

Let's proceed to step 9:
The number 77 fits into 670 8 times, leaving a remainder of 54.
Write down 8 as next digit of the result. 
Result so far: 8370.298
If we subtract 616 from 670, we get 54.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

Step 10:
The number 77 fits into 540 7 times, leaving a remainder of 1.
Put 7 as the next digit of the answer. 
Result so far: 8370.2987
Subtract 539 from 540 to get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Moving on to step 11:
77 can be fit into 10 0 times, resulting in a remainder of 10.
Record the quotient 0 as the next digit in the result. 
Result so far: 8370.2987
Subtracting 0 from 10 leaves us 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.

Moving on to step 12:
If we divide 100 by 77, we get 1 and a remainder of 23.
Put 1 as the next digit of the answer. 
Result so far: 8370.298701
Subtract 77 from 100 to get 23.
Since there are no more digits in the dividend, we add a zero to the remainder making it 230, and continue the process.

Advancing to step 13:
The number 77 fits into 230 2 times, leaving a remainder of 76.
Write down 2 as next digit of the result. 
Result so far: 8370.2987012
Subtract 154 from 230 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.

Let's proceed to step 14:
The number 77 fits into 760 9 times, leaving a remainder of 67.
The number 9 becomes the next digit in our result. 
Result so far: 8370.29870129
If we subtract 693 from 760, we get 67.
Since there are no more digits in the dividend, we add a zero to the remainder making it 670, and continue the process.

The final result is 8370.29870129 with a remainder of 6.7e-08.