Let's divide 644351 by 77
We're looking to find how many times 77 goes into 644351.

Going ahead to step 1:
When dividing 6 by 77, we get 0 with a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Bring next digit (4) of the dividend behind the 6 and repeat the process: 64 / 77

On to step 2:
If we divide 64 by 77, we get 0 and a remainder of 64.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 64 to get 64.
Take the next digit (4) from the dividend and append it to 64, then repeat: 644 / 77

On to step 3:
77 goes into 644 8 times with a remainder of 28.
Write down 8 as next digit of the result. 
Result so far: 8.0
If we take 616 away from 644, we end up with 28.
Grab the next digit (3) from the dividend, add it to 28, then carry on: 283 / 77

Moving on to step 4:
When dividing 283 by 77, we get 3 with a remainder of 52.
The next digit of our result is 3. 
Result so far: 83.0
If we take 231 away from 283, we end up with 52.
Append the next digit (5) from the dividend to 52 and continue with: 525 / 77

Step 5:
When dividing 525 by 77, we get 6 with a remainder of 63.
Record the quotient 6 as the next digit in the result. 
Result so far: 836.0
Subtract 462 from 525 to get 63.
Include the next digit (1) from the dividend after 63, then repeat: 631 / 77

On to step 6:
If we divide 631 by 77, we get 8 and a remainder of 15.
Write down 8 as next digit of the result. 
Result so far: 8368.0
Subtract 616 from 631 to get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

On to step 7:
150 divided by 77 is 1 with a remainder of 73.
Put 1 as the next digit of the answer. 
Result so far: 8368.1
If we subtract 77 from 150, we get 73.
Since there are no more digits in the dividend, we add a zero to the remainder making it 730, and continue the process.

Moving on to step 8:
When dividing 730 by 77, we get 9 with a remainder of 37.
Write down 9 as next digit of the result. 
Result so far: 8368.19
If we subtract 693 from 730, we get 37.
Since there are no more digits in the dividend, we add a zero to the remainder making it 370, and continue the process.

Moving on to step 9:
The number 77 fits into 370 4 times, leaving a remainder of 62.
The next digit of our result is 4. 
Result so far: 8368.194
Subtract 308 from 370 to get 62.
Since there are no more digits in the dividend, we add a zero to the remainder making it 620, and continue the process.

Step 10:
The number 77 fits into 620 8 times, leaving a remainder of 4.
Record the quotient 8 as the next digit in the result. 
Result so far: 8368.1948
Deduct 616 from 620 and we're left with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Advancing to step 11:
The number 77 fits into 40 0 times, leaving a remainder of 40.
The number 0 becomes the next digit in our result. 
Result so far: 8368.1948
Deduct 0 from 40 and we're left with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

On to step 12:
When dividing 400 by 77, we get 5 with a remainder of 15.
Write down 5 as next digit of the result. 
Result so far: 8368.194805
Subtract 385 from 400 to get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Going ahead to step 13:
When dividing 150 by 77, we get 1 with a remainder of 73.
The next digit of our result is 1. 
Result so far: 8368.1948051
If we subtract 77 from 150, we get 73.
Since there are no more digits in the dividend, we add a zero to the remainder making it 730, and continue the process.

Moving on to step 14:
When dividing 730 by 77, we get 9 with a remainder of 37.
Use 9 as the next digit of our solution. 
Result so far: 8368.19480519
If we take 693 away from 730, we end up with 37.
Since there are no more digits in the dividend, we add a zero to the remainder making it 370, and continue the process.

Our division results in 8368.19480519 with a remaining 3.7e-08.