We're dividing 86537863 by 870 
The aim is to understand the frequency of 870 in 86537863.

Let's proceed to step 1:
8 divided by 870 is 0 with a remainder of 8.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 8 after subtracting 0 from 8.
Grab the next digit (6) from the dividend, add it to 8, then carry on: 86 / 870

On to step 2:
870 goes into 86 0 times with a remainder of 86.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 86 after subtracting 0 from 86.
Bring next digit (5) of the dividend behind the 86 and repeat the process: 865 / 870

Step 3:
The number 870 fits into 865 0 times, leaving a remainder of 865.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 865, we get 865.
Fetch the next digit (3) from the dividend, attach it to 865 and continue: 8653 / 870

Moving on to step 4:
870 can be fit into 8653 9 times, resulting in a remainder of 823.
Write down 9 as next digit of the result. 
Result so far: 9.0
If we subtract 7830 from 8653, we get 823.
Include the next digit (7) from the dividend after 823, then repeat: 8237 / 870

On to step 5:
870 can be fit into 8237 9 times, resulting in a remainder of 407.
The number 9 becomes the next digit in our result. 
Result so far: 99.0
The remainder is 407 after subtracting 7830 from 8237.
Fetch the next digit (8) from the dividend, attach it to 407 and continue: 4078 / 870

Going ahead to step 6:
When dividing 4078 by 870, we get 4 with a remainder of 598.
Put 4 as the next digit of the answer. 
Result so far: 994.0
If we subtract 3480 from 4078, we get 598.
Grab the next digit (6) from the dividend, add it to 598, then carry on: 5986 / 870

Step 7:
The number 870 fits into 5986 6 times, leaving a remainder of 766.
Write down 6 as next digit of the result. 
Result so far: 9946.0
Subtracting 5220 from 5986 leaves us with 766.
Include the next digit (3) from the dividend after 766, then repeat: 7663 / 870

Step 8:
When dividing 7663 by 870, we get 8 with a remainder of 703.
The number 8 becomes the next digit in our result. 
Result so far: 99468.0
Subtract 6960 from 7663 to get 703.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7030, and continue the process.

Step 9:
870 can be fit into 7030 8 times, resulting in a remainder of 70.
Record the quotient 8 as the next digit in the result. 
Result so far: 99468.8
Deduct 6960 from 7030 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.

Advancing to step 10:
The number 870 fits into 700 0 times, leaving a remainder of 700.
Write down 0 as next digit of the result. 
Result so far: 99468.8
Subtracting 0 from 700 leaves us with 700.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7000, and continue the process.

Going ahead to step 11:
870 can be fit into 7000 8 times, resulting in a remainder of 40.
Use 8 as the next digit of our solution. 
Result so far: 99468.808
Subtracting 6960 from 7000 leaves us with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Advancing to step 12:
870 goes into 400 0 times with a remainder of 400.
Record the quotient 0 as the next digit in the result. 
Result so far: 99468.808
If we subtract 0 from 400, we get 400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4000, and continue the process.

Moving on to step 13:
870 goes into 4000 4 times with a remainder of 520.
Use 4 as the next digit of our solution. 
Result so far: 99468.80804
If we subtract 3480 from 4000, we get 520.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5200, and continue the process.

Advancing to step 14:
5200 divided by 870 is 5 with a remainder of 850.
Use 5 as the next digit of our solution. 
Result so far: 99468.808045
If we subtract 4350 from 5200, we get 850.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8500, and continue the process.

On to step 15:
The number 870 fits into 8500 9 times, leaving a remainder of 670.
The next digit of our result is 9. 
Result so far: 99468.8080459
Subtracting 7830 from 8500 leaves us with 670.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6700, and continue the process.

On to step 16:
870 can be fit into 6700 7 times, resulting in a remainder of 610.
Put 7 as the next digit of the answer. 
Result so far: 99468.80804597
Subtracting 6090 from 6700 leaves us with 610.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6100, and continue the process.

The final outcome is 99468.80804597, with a leftover of 6.1e-07.