80251370 ÷ 8 
Our goal is to divide 80251370 by 8.

Advancing to step 1:
8 divided by 8 is 1 with a remainder of 0.
Use 1 as the next digit of our solution. 
Result so far: 1.0
If we take 8 away from 8, we end up with 0.
Bring next digit (0) of the dividend behind the 0 and repeat the process: 0 / 8

Let's proceed to step 2:
0 divided by 8 is 0 with a remainder of 0.
The next digit of our result is 0. 
Result so far: 10.0
If we subtract 0 from 0, we get 0.
Grab the next digit (2) from the dividend, add it to 0, then carry on: 2 / 8

Moving on to step 3:
The number 8 fits into 2 0 times, leaving a remainder of 2.
Record the quotient 0 as the next digit in the result. 
Result so far: 100.0
The remainder is 2 after subtracting 0 from 2.
Fetch the next digit (5) from the dividend, attach it to 2 and continue: 25 / 8

Going ahead to step 4:
25 divided by 8 is 3 with a remainder of 1.
Put 3 as the next digit of the answer. 
Result so far: 1003.0
If we take 24 away from 25, we end up with 1.
Include the next digit (1) from the dividend after 1, then repeat: 11 / 8

Step 5:
8 goes into 11 1 times with a remainder of 3.
Use 1 as the next digit of our solution. 
Result so far: 10031.0
Subtracting 8 from 11 leaves us with 3.
Append the next digit (3) from the dividend to 3 and continue with: 33 / 8

Going ahead to step 6:
When dividing 33 by 8, we get 4 with a remainder of 1.
Record the quotient 4 as the next digit in the result. 
Result so far: 100314.0
The remainder is 1 after subtracting 32 from 33.
Include the next digit (7) from the dividend after 1, then repeat: 17 / 8

On to step 7:
17 divided by 8 is 2 with a remainder of 1.
Put 2 as the next digit of the answer. 
Result so far: 1003142.0
Subtract 16 from 17 to get 1.
Take the next digit (0) from the dividend and append it to 1, then repeat: 10 / 8

Let's proceed to step 8:
8 can be fit into 10 1 times, resulting in a remainder of 2.
Write down 1 as next digit of the result. 
Result so far: 10031421.0
Subtract 8 from 10 to get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Step 9:
The number 8 fits into 20 2 times, leaving a remainder of 4.
Put 2 as the next digit of the answer. 
Result so far: 10031421.2
If we subtract 16 from 20, we get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Going ahead to step 10:
8 goes into 40 5 times with a remainder of 0.
Record the quotient 5 as the next digit in the result. 
Result so far: 10031421.25
The remainder is 0 after subtracting 40 from 40.
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 11:
If we divide 0 by 8, we get 0 and a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 10031421.25
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.

Let's proceed to step 12:
The number 8 fits into 0 0 times, leaving a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 10031421.25
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 outcome is 10031421.25, with a leftover of 0.0.