We look at the division of 86200349 by 123 
The aim is to understand the frequency of 123 in 86200349.

Advancing to step 1:
If we divide 8 by 123, 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.
Grab the next digit (6) from the dividend, add it to 8, then carry on: 86 / 123

Let's proceed to step 2:
123 can be fit into 86 0 times, resulting in a remainder of 86.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 86 after subtracting 0 from 86.
Take the next digit (2) from the dividend and append it to 86, then repeat: 862 / 123

Going ahead to step 3:
When dividing 862 by 123, we get 7 with a remainder of 1.
Put 7 as the next digit of the answer. 
Result so far: 7.0
Deduct 861 from 862 and we're left with 1.
Bring next digit (0) of the dividend behind the 1 and repeat the process: 10 / 123

Going ahead to step 4:
10 divided by 123 is 0 with a remainder of 10.
Write down 0 as next digit of the result. 
Result so far: 70.0
Subtracting 0 from 10 leaves us with 10.
Fetch the next digit (0) from the dividend, attach it to 10 and continue: 100 / 123

Advancing to step 5:
When dividing 100 by 123, we get 0 with a remainder of 100.
Record the quotient 0 as the next digit in the result. 
Result so far: 700.0
If we take 0 away from 100, we end up with 100.
Include the next digit (3) from the dividend after 100, then repeat: 1003 / 123

Going ahead to step 6:
If we divide 1003 by 123, we get 8 and a remainder of 19.
Write down 8 as next digit of the result. 
Result so far: 7008.0
Deduct 984 from 1003 and we're left with 19.
Bring next digit (4) of the dividend behind the 19 and repeat the process: 194 / 123

Let's proceed to step 7:
The number 123 fits into 194 1 times, leaving a remainder of 71.
The next digit of our result is 1. 
Result so far: 70081.0
The remainder is 71 after subtracting 123 from 194.
Bring next digit (9) of the dividend behind the 71 and repeat the process: 719 / 123

Moving on to step 8:
719 divided by 123 is 5 with a remainder of 104.
Use 5 as the next digit of our solution. 
Result so far: 700815.0
The remainder is 104 after subtracting 615 from 719.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1040, and continue the process.

Let's proceed to step 9:
The number 123 fits into 1040 8 times, leaving a remainder of 56.
Record the quotient 8 as the next digit in the result. 
Result so far: 700815.8
Subtracting 984 from 1040 leaves us with 56.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

On to step 10:
560 divided by 123 is 4 with a remainder of 68.
Record the quotient 4 as the next digit in the result. 
Result so far: 700815.84
If we take 492 away from 560, we end up with 68.
Since there are no more digits in the dividend, we add a zero to the remainder making it 680, and continue the process.

Let's proceed to step 11:
680 divided by 123 is 5 with a remainder of 65.
The number 5 becomes the next digit in our result. 
Result so far: 700815.845
The remainder is 65 after subtracting 615 from 680.
Since there are no more digits in the dividend, we add a zero to the remainder making it 650, and continue the process.

Advancing to step 12:
The number 123 fits into 650 5 times, leaving a remainder of 35.
Put 5 as the next digit of the answer. 
Result so far: 700815.8455
Deduct 615 from 650 and we're left with 35.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

Our division results in 700815.8455 with a remaining 0.00035.