We're dividing 86512119 by 10 
We want to figure out the number of times 86512119 can be divided by 10.

Step 1:
10 can be fit into 8 0 times, resulting in a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Fetch the next digit (6) from the dividend, attach it to 8 and continue: 86 / 10

Step 2:
If we divide 86 by 10, we get 8 and a remainder of 6.
Put 8 as the next digit of the answer. 
Result so far: 8.0
Deduct 80 from 86 and we're left with 6.
Grab the next digit (5) from the dividend, add it to 6, then carry on: 65 / 10

Let's proceed to step 3:
When dividing 65 by 10, we get 6 with a remainder of 5.
Write down 6 as next digit of the result. 
Result so far: 86.0
Subtracting 60 from 65 leaves us with 5.
Take the next digit (1) from the dividend and append it to 5, then repeat: 51 / 10

Going ahead to step 4:
10 goes into 51 5 times with a remainder of 1.
Record the quotient 5 as the next digit in the result. 
Result so far: 865.0
If we take 50 away from 51, we end up with 1.
Include the next digit (2) from the dividend after 1, then repeat: 12 / 10

Advancing to step 5:
10 goes into 12 1 times with a remainder of 2.
Use 1 as the next digit of our solution. 
Result so far: 8651.0
Subtracting 10 from 12 leaves us with 2.
Bring next digit (1) of the dividend behind the 2 and repeat the process: 21 / 10

Advancing to step 6:
10 goes into 21 2 times with a remainder of 1.
Use 2 as the next digit of our solution. 
Result so far: 86512.0
Subtracting 20 from 21 leaves us with 1.
Fetch the next digit (1) from the dividend, attach it to 1 and continue: 11 / 10

On to step 7:
10 can be fit into 11 1 times, resulting in a remainder of 1.
Use 1 as the next digit of our solution. 
Result so far: 865121.0
If we take 10 away from 11, we end up with 1.
Bring next digit (9) of the dividend behind the 1 and repeat the process: 19 / 10

Moving on to step 8:
10 can be fit into 19 1 times, resulting in a remainder of 9.
Record the quotient 1 as the next digit in the result. 
Result so far: 8651211.0
Deduct 10 from 19 and we're left with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

On to step 9:
10 goes into 90 9 times with a remainder of 0.
Put 9 as the next digit of the answer. 
Result so far: 8651211.9
Subtracting 90 from 90 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.

Let's proceed to step 10:
If we divide 0 by 10, we get 0 and a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 8651211.9
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.

Let's proceed to step 11:
10 goes into 0 0 times with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 8651211.9
The remainder is 0 after subtracting 0 from 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 8651211.9, with a leftover of 0.0.