77998652 ÷ 640 
We want to divide 77998652 by 640.

Advancing to step 1:
If we divide 7 by 640, we get 0 and a remainder of 7.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 7, we end up with 7.
Grab the next digit (7) from the dividend, add it to 7, then carry on: 77 / 640

Let's proceed to step 2:
77 divided by 640 is 0 with a remainder of 77.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 77, we end up with 77.
Fetch the next digit (9) from the dividend, attach it to 77 and continue: 779 / 640

Advancing to step 3:
640 can be fit into 779 1 times, resulting in a remainder of 139.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Subtracting 640 from 779 leaves us with 139.
Fetch the next digit (9) from the dividend, attach it to 139 and continue: 1399 / 640

Let's proceed to step 4:
If we divide 1399 by 640, we get 2 and a remainder of 119.
Put 2 as the next digit of the answer. 
Result so far: 12.0
Deduct 1280 from 1399 and we're left with 119.
Include the next digit (8) from the dividend after 119, then repeat: 1198 / 640

Let's proceed to step 5:
1198 divided by 640 is 1 with a remainder of 558.
The next digit of our result is 1. 
Result so far: 121.0
The remainder is 558 after subtracting 640 from 1198.
Bring next digit (6) of the dividend behind the 558 and repeat the process: 5586 / 640

On to step 6:
640 can be fit into 5586 8 times, resulting in a remainder of 466.
Use 8 as the next digit of our solution. 
Result so far: 1218.0
If we subtract 5120 from 5586, we get 466.
Include the next digit (5) from the dividend after 466, then repeat: 4665 / 640

Step 7:
When dividing 4665 by 640, we get 7 with a remainder of 185.
The number 7 becomes the next digit in our result. 
Result so far: 12187.0
If we subtract 4480 from 4665, we get 185.
Take the next digit (2) from the dividend and append it to 185, then repeat: 1852 / 640

Advancing to step 8:
640 can be fit into 1852 2 times, resulting in a remainder of 572.
The next digit of our result is 2. 
Result so far: 121872.0
The remainder is 572 after subtracting 1280 from 1852.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5720, and continue the process.

On to step 9:
When dividing 5720 by 640, we get 8 with a remainder of 600.
Record the quotient 8 as the next digit in the result. 
Result so far: 121872.8
Deduct 5120 from 5720 and we're left with 600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6000, and continue the process.

On to step 10:
If we divide 6000 by 640, we get 9 and a remainder of 240.
The next digit of our result is 9. 
Result so far: 121872.89
Subtract 5760 from 6000 to get 240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2400, and continue the process.

On to step 11:
640 goes into 2400 3 times with a remainder of 480.
Use 3 as the next digit of our solution. 
Result so far: 121872.893
Deduct 1920 from 2400 and we're left with 480.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4800, and continue the process.

Advancing to step 12:
640 can be fit into 4800 7 times, resulting in a remainder of 320.
Put 7 as the next digit of the answer. 
Result so far: 121872.8937
If we take 4480 away from 4800, we end up with 320.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3200, and continue the process.

On to step 13:
3200 divided by 640 is 5 with a remainder of 0.
The next digit of our result is 5. 
Result so far: 121872.89375
If we take 3200 away from 3200, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 14:
When dividing 0 by 640, we get 0 with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 121872.89375
Subtracting 0 from 0 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 15:
640 goes into 0 0 times with a remainder of 0.
The next digit of our result is 0. 
Result so far: 121872.89375
Subtract 0 from 0 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final outcome is 121872.89375, with a leftover of 0.0.