We're dividing 870548 by 86 
We want to figure out the number of times 870548 can be divided by 86.

Step 1:
If we divide 8 by 86, we get 0 and 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.
Include the next digit (7) from the dividend after 8, then repeat: 87 / 86

Moving on to step 2:
87 divided by 86 is 1 with a remainder of 1.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
The remainder is 1 after subtracting 86 from 87.
Fetch the next digit (0) from the dividend, attach it to 1 and continue: 10 / 86

On to step 3:
86 can be fit into 10 0 times, resulting in a remainder of 10.
The next digit of our result is 0. 
Result so far: 10.0
If we subtract 0 from 10, we get 10.
Take the next digit (5) from the dividend and append it to 10, then repeat: 105 / 86

Moving on to step 4:
The number 86 fits into 105 1 times, leaving a remainder of 19.
Record the quotient 1 as the next digit in the result. 
Result so far: 101.0
The remainder is 19 after subtracting 86 from 105.
Fetch the next digit (4) from the dividend, attach it to 19 and continue: 194 / 86

Advancing to step 5:
If we divide 194 by 86, we get 2 and a remainder of 22.
The number 2 becomes the next digit in our result. 
Result so far: 1012.0
If we take 172 away from 194, we end up with 22.
Bring next digit (8) of the dividend behind the 22 and repeat the process: 228 / 86

Advancing to step 6:
86 goes into 228 2 times with a remainder of 56.
Put 2 as the next digit of the answer. 
Result so far: 10122.0
The remainder is 56 after subtracting 172 from 228.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

Advancing to step 7:
86 goes into 560 6 times with a remainder of 44.
Write down 6 as next digit of the result. 
Result so far: 10122.6
The remainder is 44 after subtracting 516 from 560.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

Let's proceed to step 8:
The number 86 fits into 440 5 times, leaving a remainder of 10.
The next digit of our result is 5. 
Result so far: 10122.65
Subtracting 430 from 440 leaves us with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Step 9:
100 divided by 86 is 1 with a remainder of 14.
Put 1 as the next digit of the answer. 
Result so far: 10122.651
Deduct 86 from 100 and we're left with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Going ahead to step 10:
86 can be fit into 140 1 times, resulting in a remainder of 54.
The next digit of our result is 1. 
Result so far: 10122.6511
If we take 86 away from 140, we end up with 54.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

Our division results in 10122.6511 with a remaining 0.00054.