861543 ÷ 86 
The aim is to understand the frequency of 86 in 861543.

On to step 1:
The number 86 fits into 8 0 times, leaving a remainder of 8.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Grab the next digit (6) from the dividend, add it to 8, then carry on: 86 / 86

Let's proceed to step 2:
86 goes into 86 1 times with a remainder of 0.
The next digit of our result is 1. 
Result so far: 1.0
If we take 86 away from 86, we end up with 0.
Bring next digit (1) of the dividend behind the 0 and repeat the process: 1 / 86

On to step 3:
When dividing 1 by 86, we get 0 with a remainder of 1.
The next digit of our result is 0. 
Result so far: 10.0
Deduct 0 from 1 and we're left with 1.
Append the next digit (5) from the dividend to 1 and continue with: 15 / 86

Moving on to step 4:
15 divided by 86 is 0 with a remainder of 15.
Write down 0 as next digit of the result. 
Result so far: 100.0
Subtracting 0 from 15 leaves us with 15.
Take the next digit (4) from the dividend and append it to 15, then repeat: 154 / 86

Advancing to step 5:
154 divided by 86 is 1 with a remainder of 68.
Use 1 as the next digit of our solution. 
Result so far: 1001.0
Deduct 86 from 154 and we're left with 68.
Bring next digit (3) of the dividend behind the 68 and repeat the process: 683 / 86

Moving on to step 6:
When dividing 683 by 86, we get 7 with a remainder of 81.
Put 7 as the next digit of the answer. 
Result so far: 10017.0
Deduct 602 from 683 and we're left with 81.
Since there are no more digits in the dividend, we add a zero to the remainder making it 810, and continue the process.

Let's proceed to step 7:
The number 86 fits into 810 9 times, leaving a remainder of 36.
Put 9 as the next digit of the answer. 
Result so far: 10017.9
If we subtract 774 from 810, we get 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

On to step 8:
The number 86 fits into 360 4 times, leaving a remainder of 16.
Record the quotient 4 as the next digit in the result. 
Result so far: 10017.94
The remainder is 16 after subtracting 344 from 360.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Advancing to step 9:
86 can be fit into 160 1 times, resulting in a remainder of 74.
The number 1 becomes the next digit in our result. 
Result so far: 10017.941
Deduct 86 from 160 and we're left with 74.
Since there are no more digits in the dividend, we add a zero to the remainder making it 740, and continue the process.

Moving on to step 10:
The number 86 fits into 740 8 times, leaving a remainder of 52.
Use 8 as the next digit of our solution. 
Result so far: 10017.9418
Deduct 688 from 740 and we're left with 52.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

Let's proceed to step 11:
When dividing 520 by 86, we get 6 with a remainder of 4.
The next digit of our result is 6. 
Result so far: 10017.94186
Deduct 516 from 520 and we're left with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

On to step 12:
The number 86 fits into 40 0 times, leaving a remainder of 40.
Record the quotient 0 as the next digit in the result. 
Result so far: 10017.94186
Subtracting 0 from 40 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.

Moving on to step 13:
When dividing 400 by 86, we get 4 with a remainder of 56.
Put 4 as the next digit of the answer. 
Result so far: 10017.9418604
If we subtract 344 from 400, we get 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

Let's proceed to step 14:
86 goes into 560 6 times with a remainder of 44.
Put 6 as the next digit of the answer. 
Result so far: 10017.94186046
Deduct 516 from 560 and we're left with 44.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

After the division, we end up with 10017.94186046 and a remainder of 4.4e-08.