We look at the division of 77616430 by 644 
Our goal is to divide 77616430 by 644.

Moving on to step 1:
7 divided by 644 is 0 with a remainder of 7.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 7 after subtracting 0 from 7.
Bring next digit (7) of the dividend behind the 7 and repeat the process: 77 / 644

Moving on to step 2:
644 can be fit into 77 0 times, resulting in a remainder of 77.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 77 after subtracting 0 from 77.
Take the next digit (6) from the dividend and append it to 77, then repeat: 776 / 644

Step 3:
644 can be fit into 776 1 times, resulting in a remainder of 132.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Subtracting 644 from 776 leaves us with 132.
Include the next digit (1) from the dividend after 132, then repeat: 1321 / 644

Let's proceed to step 4:
If we divide 1321 by 644, we get 2 and a remainder of 33.
Put 2 as the next digit of the answer. 
Result so far: 12.0
Subtract 1288 from 1321 to get 33.
Take the next digit (6) from the dividend and append it to 33, then repeat: 336 / 644

Let's proceed to step 5:
644 can be fit into 336 0 times, resulting in a remainder of 336.
Record the quotient 0 as the next digit in the result. 
Result so far: 120.0
If we take 0 away from 336, we end up with 336.
Bring next digit (4) of the dividend behind the 336 and repeat the process: 3364 / 644

Moving on to step 6:
When dividing 3364 by 644, we get 5 with a remainder of 144.
The number 5 becomes the next digit in our result. 
Result so far: 1205.0
If we subtract 3220 from 3364, we get 144.
Bring next digit (3) of the dividend behind the 144 and repeat the process: 1443 / 644

Let's proceed to step 7:
The number 644 fits into 1443 2 times, leaving a remainder of 155.
The next digit of our result is 2. 
Result so far: 12052.0
Subtracting 1288 from 1443 leaves us with 155.
Fetch the next digit (0) from the dividend, attach it to 155 and continue: 1550 / 644

Advancing to step 8:
1550 divided by 644 is 2 with a remainder of 262.
Use 2 as the next digit of our solution. 
Result so far: 120522.0
Subtracting 1288 from 1550 leaves us with 262.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2620, and continue the process.

Advancing to step 9:
644 can be fit into 2620 4 times, resulting in a remainder of 44.
Put 4 as the next digit of the answer. 
Result so far: 120522.4
Subtract 2576 from 2620 to get 44.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

Advancing to step 10:
644 goes into 440 0 times with a remainder of 440.
Record the quotient 0 as the next digit in the result. 
Result so far: 120522.4
If we subtract 0 from 440, we get 440.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4400, and continue the process.

Let's proceed to step 11:
When dividing 4400 by 644, we get 6 with a remainder of 536.
Record the quotient 6 as the next digit in the result. 
Result so far: 120522.406
If we take 3864 away from 4400, we end up with 536.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5360, and continue the process.

Step 12:
The number 644 fits into 5360 8 times, leaving a remainder of 208.
Put 8 as the next digit of the answer. 
Result so far: 120522.4068
The remainder is 208 after subtracting 5152 from 5360.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2080, and continue the process.

Advancing to step 13:
When dividing 2080 by 644, we get 3 with a remainder of 148.
Record the quotient 3 as the next digit in the result. 
Result so far: 120522.40683
Subtract 1932 from 2080 to get 148.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1480, and continue the process.

Advancing to step 14:
644 goes into 1480 2 times with a remainder of 192.
The number 2 becomes the next digit in our result. 
Result so far: 120522.406832
Subtracting 1288 from 1480 leaves us with 192.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1920, and continue the process.

Moving on to step 15:
When dividing 1920 by 644, we get 2 with a remainder of 632.
Write down 2 as next digit of the result. 
Result so far: 120522.4068322
Subtract 1288 from 1920 to get 632.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6320, and continue the process.

The final outcome is 120522.4068322, with a leftover of 6.32e-06.