870580 divided by 86 
We want to figure out the number of times 870580 can be divided by 86.

Going ahead to step 1:
If we divide 8 by 86, we get 0 and a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Bring next digit (7) of the dividend behind the 8 and repeat the process: 87 / 86

On to step 2:
The number 86 fits into 87 1 times, leaving a remainder of 1.
Write down 1 as next digit of the result. 
Result so far: 1.0
Subtract 86 from 87 to get 1.
Bring next digit (0) of the dividend behind the 1 and repeat the process: 10 / 86

Moving on to step 3:
86 goes into 10 0 times with a remainder of 10.
The next digit of our result is 0. 
Result so far: 10.0
If we take 0 away from 10, we end up with 10.
Bring next digit (5) of the dividend behind the 10 and repeat the process: 105 / 86

Moving on to step 4:
86 can be fit into 105 1 times, resulting in a remainder of 19.
Record the quotient 1 as the next digit in the result. 
Result so far: 101.0
Subtract 86 from 105 to get 19.
Bring next digit (8) of the dividend behind the 19 and repeat the process: 198 / 86

On to step 5:
When dividing 198 by 86, we get 2 with a remainder of 26.
Record the quotient 2 as the next digit in the result. 
Result so far: 1012.0
If we subtract 172 from 198, we get 26.
Include the next digit (0) from the dividend after 26, then repeat: 260 / 86

Going ahead to step 6:
When dividing 260 by 86, we get 3 with a remainder of 2.
The next digit of our result is 3. 
Result so far: 10123.0
The remainder is 2 after subtracting 258 from 260.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

On to step 7:
The number 86 fits into 20 0 times, leaving a remainder of 20.
Write down 0 as next digit of the result. 
Result so far: 10123.0
Subtract 0 from 20 to get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

On to step 8:
If we divide 200 by 86, we get 2 and a remainder of 28.
Use 2 as the next digit of our solution. 
Result so far: 10123.02
Subtracting 172 from 200 leaves us with 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Advancing to step 9:
280 divided by 86 is 3 with a remainder of 22.
Use 3 as the next digit of our solution. 
Result so far: 10123.023
If we subtract 258 from 280, we get 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

On to step 10:
86 goes into 220 2 times with a remainder of 48.
Write down 2 as next digit of the result. 
Result so far: 10123.0232
If we take 172 away from 220, we end up with 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

On to step 11:
If we divide 480 by 86, we get 5 and a remainder of 50.
The next digit of our result is 5. 
Result so far: 10123.02325
If we take 430 away from 480, we end up with 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Let's proceed to step 12:
86 goes into 500 5 times with a remainder of 70.
Record the quotient 5 as the next digit in the result. 
Result so far: 10123.023255
Deduct 430 from 500 and we're left with 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

After the division, we end up with 10123.023255 and a remainder of 7e-06.