51386554 divided by 640 
We want to divide 51386554 by 640.

Let's proceed to step 1:
640 goes into 5 0 times with a remainder of 5.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 5 leaves us with 5.
Fetch the next digit (1) from the dividend, attach it to 5 and continue: 51 / 640

Moving on to step 2:
640 can be fit into 51 0 times, resulting in a remainder of 51.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 51, we get 51.
Fetch the next digit (3) from the dividend, attach it to 51 and continue: 513 / 640

Moving on to step 3:
When dividing 513 by 640, we get 0 with a remainder of 513.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 513 and we're left with 513.
Append the next digit (8) from the dividend to 513 and continue with: 5138 / 640

Moving on to step 4:
640 can be fit into 5138 8 times, resulting in a remainder of 18.
Put 8 as the next digit of the answer. 
Result so far: 8.0
Subtract 5120 from 5138 to get 18.
Fetch the next digit (6) from the dividend, attach it to 18 and continue: 186 / 640

On to step 5:
640 can be fit into 186 0 times, resulting in a remainder of 186.
Write down 0 as next digit of the result. 
Result so far: 80.0
Deduct 0 from 186 and we're left with 186.
Grab the next digit (5) from the dividend, add it to 186, then carry on: 1865 / 640

Moving on to step 6:
The number 640 fits into 1865 2 times, leaving a remainder of 585.
Record the quotient 2 as the next digit in the result. 
Result so far: 802.0
Deduct 1280 from 1865 and we're left with 585.
Fetch the next digit (5) from the dividend, attach it to 585 and continue: 5855 / 640

Going ahead to step 7:
640 goes into 5855 9 times with a remainder of 95.
Record the quotient 9 as the next digit in the result. 
Result so far: 8029.0
Subtract 5760 from 5855 to get 95.
Take the next digit (4) from the dividend and append it to 95, then repeat: 954 / 640

Going ahead to step 8:
The number 640 fits into 954 1 times, leaving a remainder of 314.
Put 1 as the next digit of the answer. 
Result so far: 80291.0
Deduct 640 from 954 and we're left with 314.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3140, and continue the process.

Going ahead to step 9:
The number 640 fits into 3140 4 times, leaving a remainder of 580.
Record the quotient 4 as the next digit in the result. 
Result so far: 80291.4
Subtract 2560 from 3140 to get 580.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5800, and continue the process.

On to step 10:
5800 divided by 640 is 9 with a remainder of 40.
Use 9 as the next digit of our solution. 
Result so far: 80291.49
If we take 5760 away from 5800, we end up 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 11:
When dividing 400 by 640, we get 0 with a remainder of 400.
Use 0 as the next digit of our solution. 
Result so far: 80291.49
If we take 0 away from 400, we end up with 400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4000, and continue the process.

Advancing to step 12:
640 goes into 4000 6 times with a remainder of 160.
Write down 6 as next digit of the result. 
Result so far: 80291.4906
Subtracting 3840 from 4000 leaves us with 160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1600, and continue the process.

Let's proceed to step 13:
1600 divided by 640 is 2 with a remainder of 320.
The number 2 becomes the next digit in our result. 
Result so far: 80291.49062
Subtracting 1280 from 1600 leaves us 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.

Going ahead to step 14:
640 goes into 3200 5 times with a remainder of 0.
The next digit of our result is 5. 
Result so far: 80291.490625
Deduct 3200 from 3200 and we're left 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.

Let's proceed to step 15:
0 divided by 640 is 0 with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 80291.490625
If we subtract 0 from 0, we 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.

Moving on to step 16:
640 goes into 0 0 times with a remainder of 0.
The next digit of our result is 0. 
Result so far: 80291.490625
Deduct 0 from 0 and we're left 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.

The final outcome is 80291.490625, with a leftover of 0.0.