Let's divide 87511389 by 7
We want to divide 87511389 by 7.

Step 1:
If we divide 8 by 7, we get 1 and a remainder of 1.
Write down 1 as next digit of the result. 
Result so far: 1.0
The remainder is 1 after subtracting 7 from 8.
Fetch the next digit (7) from the dividend, attach it to 1 and continue: 17 / 7

On to step 2:
17 divided by 7 is 2 with a remainder of 3.
Record the quotient 2 as the next digit in the result. 
Result so far: 12.0
If we subtract 14 from 17, we get 3.
Fetch the next digit (5) from the dividend, attach it to 3 and continue: 35 / 7

Advancing to step 3:
The number 7 fits into 35 5 times, leaving a remainder of 0.
The next digit of our result is 5. 
Result so far: 125.0
The remainder is 0 after subtracting 35 from 35.
Grab the next digit (1) from the dividend, add it to 0, then carry on: 1 / 7

Step 4:
7 goes into 1 0 times with a remainder of 1.
Use 0 as the next digit of our solution. 
Result so far: 1250.0
Subtracting 0 from 1 leaves us with 1.
Include the next digit (1) from the dividend after 1, then repeat: 11 / 7

Going ahead to step 5:
When dividing 11 by 7, we get 1 with a remainder of 4.
Record the quotient 1 as the next digit in the result. 
Result so far: 12501.0
The remainder is 4 after subtracting 7 from 11.
Take the next digit (3) from the dividend and append it to 4, then repeat: 43 / 7

Moving on to step 6:
7 goes into 43 6 times with a remainder of 1.
Write down 6 as next digit of the result. 
Result so far: 125016.0
If we subtract 42 from 43, we get 1.
Grab the next digit (8) from the dividend, add it to 1, then carry on: 18 / 7

Step 7:
7 can be fit into 18 2 times, resulting in a remainder of 4.
The next digit of our result is 2. 
Result so far: 1250162.0
If we subtract 14 from 18, we get 4.
Take the next digit (9) from the dividend and append it to 4, then repeat: 49 / 7

Let's proceed to step 8:
If we divide 49 by 7, we get 7 and a remainder of 0.
The number 7 becomes the next digit in our result. 
Result so far: 12501627.0
The remainder is 0 after subtracting 49 from 49.
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 9:
The number 7 fits into 0 0 times, leaving a remainder of 0.
The next digit of our result is 0. 
Result so far: 12501627.0
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 10:
The number 7 fits into 0 0 times, leaving a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 12501627.0
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 12501627.0, with a leftover of 0.0.