We look at the division of 37997 by 86 
The aim is to understand the frequency of 86 in 37997.

Step 1:
86 can be fit into 3 0 times, resulting in a remainder of 3.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 3, we get 3.
Grab the next digit (7) from the dividend, add it to 3, then carry on: 37 / 86

Moving on to step 2:
When dividing 37 by 86, we get 0 with a remainder of 37.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 37 leaves us with 37.
Bring next digit (9) of the dividend behind the 37 and repeat the process: 379 / 86

Moving on to step 3:
379 divided by 86 is 4 with a remainder of 35.
Write down 4 as next digit of the result. 
Result so far: 4.0
If we subtract 344 from 379, we get 35.
Bring next digit (9) of the dividend behind the 35 and repeat the process: 359 / 86

On to step 4:
When dividing 359 by 86, we get 4 with a remainder of 15.
Put 4 as the next digit of the answer. 
Result so far: 44.0
Deduct 344 from 359 and we're left with 15.
Take the next digit (7) from the dividend and append it to 15, then repeat: 157 / 86

Going ahead to step 5:
If we divide 157 by 86, we get 1 and a remainder of 71.
The next digit of our result is 1. 
Result so far: 441.0
Subtract 86 from 157 to get 71.
Since there are no more digits in the dividend, we add a zero to the remainder making it 710, and continue the process.

Let's proceed to step 6:
710 divided by 86 is 8 with a remainder of 22.
Record the quotient 8 as the next digit in the result. 
Result so far: 441.8
Deduct 688 from 710 and we're left with 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

Step 7:
The number 86 fits into 220 2 times, leaving a remainder of 48.
Put 2 as the next digit of the answer. 
Result so far: 441.82
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.

Advancing to step 8:
When dividing 480 by 86, we get 5 with a remainder of 50.
Record the quotient 5 as the next digit in the result. 
Result so far: 441.825
Deduct 430 from 480 and we're left 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.

Moving on to step 9:
86 can be fit into 500 5 times, resulting in a remainder of 70.
Write down 5 as next digit of the result. 
Result so far: 441.8255
Subtract 430 from 500 to get 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

The final outcome is 441.8255, with a leftover of 0.0007.