64512154 divided by 80 
Our goal is to divide 64512154 by 80.

Moving on to step 1:
80 goes into 6 0 times with a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Grab the next digit (4) from the dividend, add it to 6, then carry on: 64 / 80

Going ahead to step 2:
If we divide 64 by 80, we get 0 and a remainder of 64.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 64 to get 64.
Grab the next digit (5) from the dividend, add it to 64, then carry on: 645 / 80

Moving on to step 3:
When dividing 645 by 80, we get 8 with a remainder of 5.
The number 8 becomes the next digit in our result. 
Result so far: 8.0
Subtracting 640 from 645 leaves us with 5.
Bring next digit (1) of the dividend behind the 5 and repeat the process: 51 / 80

Advancing to step 4:
51 divided by 80 is 0 with a remainder of 51.
The next digit of our result is 0. 
Result so far: 80.0
If we subtract 0 from 51, we get 51.
Append the next digit (2) from the dividend to 51 and continue with: 512 / 80

Going ahead to step 5:
80 goes into 512 6 times with a remainder of 32.
The next digit of our result is 6. 
Result so far: 806.0
The remainder is 32 after subtracting 480 from 512.
Bring next digit (1) of the dividend behind the 32 and repeat the process: 321 / 80

Let's proceed to step 6:
80 can be fit into 321 4 times, resulting in a remainder of 1.
Put 4 as the next digit of the answer. 
Result so far: 8064.0
The remainder is 1 after subtracting 320 from 321.
Take the next digit (5) from the dividend and append it to 1, then repeat: 15 / 80

Step 7:
15 divided by 80 is 0 with a remainder of 15.
Use 0 as the next digit of our solution. 
Result so far: 80640.0
Deduct 0 from 15 and we're left with 15.
Take the next digit (4) from the dividend and append it to 15, then repeat: 154 / 80

On to step 8:
80 goes into 154 1 times with a remainder of 74.
Use 1 as the next digit of our solution. 
Result so far: 806401.0
Deduct 80 from 154 and we're left with 74.
Since there are no more digits in the dividend, we add a zero to the remainder making it 740, and continue the process.

On to step 9:
If we divide 740 by 80, we get 9 and a remainder of 20.
Write down 9 as next digit of the result. 
Result so far: 806401.9
Subtracting 720 from 740 leaves us with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Moving on to step 10:
If we divide 200 by 80, we get 2 and a remainder of 40.
Put 2 as the next digit of the answer. 
Result so far: 806401.92
If we take 160 away from 200, 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.

Moving on to step 11:
The number 80 fits into 400 5 times, leaving a remainder of 0.
The number 5 becomes the next digit in our result. 
Result so far: 806401.925
If we take 400 away from 400, 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.

On to step 12:
If we divide 0 by 80, we get 0 and a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 806401.925
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.

Going ahead to step 13:
80 goes into 0 0 times with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 806401.925
If we take 0 away from 0, 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.

The final result is 806401.925 with a remainder of 0.0.