86740371 divided by 861 
The aim is to understand the frequency of 861 in 86740371.

On to step 1:
8 divided by 861 is 0 with a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 8, we end up with 8.
Grab the next digit (6) from the dividend, add it to 8, then carry on: 86 / 861

Going ahead to step 2:
86 divided by 861 is 0 with a remainder of 86.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 86 leaves us with 86.
Append the next digit (7) from the dividend to 86 and continue with: 867 / 861

Going ahead to step 3:
867 divided by 861 is 1 with a remainder of 6.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Deduct 861 from 867 and we're left with 6.
Append the next digit (4) from the dividend to 6 and continue with: 64 / 861

Step 4:
64 divided by 861 is 0 with a remainder of 64.
Write down 0 as next digit of the result. 
Result so far: 10.0
Subtracting 0 from 64 leaves us with 64.
Take the next digit (0) from the dividend and append it to 64, then repeat: 640 / 861

On to step 5:
The number 861 fits into 640 0 times, leaving a remainder of 640.
Write down 0 as next digit of the result. 
Result so far: 100.0
If we subtract 0 from 640, we get 640.
Grab the next digit (3) from the dividend, add it to 640, then carry on: 6403 / 861

Advancing to step 6:
If we divide 6403 by 861, we get 7 and a remainder of 376.
The next digit of our result is 7. 
Result so far: 1007.0
The remainder is 376 after subtracting 6027 from 6403.
Grab the next digit (7) from the dividend, add it to 376, then carry on: 3767 / 861

Let's proceed to step 7:
If we divide 3767 by 861, we get 4 and a remainder of 323.
Use 4 as the next digit of our solution. 
Result so far: 10074.0
Subtracting 3444 from 3767 leaves us with 323.
Take the next digit (1) from the dividend and append it to 323, then repeat: 3231 / 861

Step 8:
If we divide 3231 by 861, we get 3 and a remainder of 648.
The number 3 becomes the next digit in our result. 
Result so far: 100743.0
The remainder is 648 after subtracting 2583 from 3231.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6480, and continue the process.

Advancing to step 9:
The number 861 fits into 6480 7 times, leaving a remainder of 453.
Put 7 as the next digit of the answer. 
Result so far: 100743.7
Subtract 6027 from 6480 to get 453.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4530, and continue the process.

Going ahead to step 10:
If we divide 4530 by 861, we get 5 and a remainder of 225.
Write down 5 as next digit of the result. 
Result so far: 100743.75
If we take 4305 away from 4530, we end up with 225.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2250, and continue the process.

Moving on to step 11:
861 goes into 2250 2 times with a remainder of 528.
The next digit of our result is 2. 
Result so far: 100743.752
Subtract 1722 from 2250 to get 528.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5280, and continue the process.

Let's proceed to step 12:
When dividing 5280 by 861, we get 6 with a remainder of 114.
The number 6 becomes the next digit in our result. 
Result so far: 100743.7526
The remainder is 114 after subtracting 5166 from 5280.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1140, and continue the process.

Going ahead to step 13:
1140 divided by 861 is 1 with a remainder of 279.
Use 1 as the next digit of our solution. 
Result so far: 100743.75261
The remainder is 279 after subtracting 861 from 1140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2790, and continue the process.

Let's proceed to step 14:
If we divide 2790 by 861, we get 3 and a remainder of 207.
Use 3 as the next digit of our solution. 
Result so far: 100743.752613
The remainder is 207 after subtracting 2583 from 2790.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2070, and continue the process.

Advancing to step 15:
If we divide 2070 by 861, we get 2 and a remainder of 348.
Write down 2 as next digit of the result. 
Result so far: 100743.7526132
If we take 1722 away from 2070, we end up with 348.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3480, and continue the process.

On to step 16:
861 goes into 3480 4 times with a remainder of 36.
The number 4 becomes the next digit in our result. 
Result so far: 100743.75261324
Subtract 3444 from 3480 to 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.

The final outcome is 100743.75261324, with a leftover of 3.6e-08.