9128870 divided by 161 
The aim is to understand the frequency of 161 in 9128870.

Moving on to step 1:
9 divided by 161 is 0 with a remainder of 9.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 9 and we're left with 9.
Grab the next digit (1) from the dividend, add it to 9, then carry on: 91 / 161

Let's proceed to step 2:
161 can be fit into 91 0 times, resulting in a remainder of 91.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 91 and we're left with 91.
Fetch the next digit (2) from the dividend, attach it to 91 and continue: 912 / 161

Let's proceed to step 3:
161 goes into 912 5 times with a remainder of 107.
Use 5 as the next digit of our solution. 
Result so far: 5.0
If we take 805 away from 912, we end up with 107.
Take the next digit (8) from the dividend and append it to 107, then repeat: 1078 / 161

On to step 4:
If we divide 1078 by 161, we get 6 and a remainder of 112.
Put 6 as the next digit of the answer. 
Result so far: 56.0
Subtract 966 from 1078 to get 112.
Grab the next digit (8) from the dividend, add it to 112, then carry on: 1128 / 161

Going ahead to step 5:
When dividing 1128 by 161, we get 7 with a remainder of 1.
The next digit of our result is 7. 
Result so far: 567.0
Deduct 1127 from 1128 and we're left with 1.
Include the next digit (7) from the dividend after 1, then repeat: 17 / 161

Going ahead to step 6:
17 divided by 161 is 0 with a remainder of 17.
Put 0 as the next digit of the answer. 
Result so far: 5670.0
Subtracting 0 from 17 leaves us with 17.
Grab the next digit (0) from the dividend, add it to 17, then carry on: 170 / 161

Advancing to step 7:
161 goes into 170 1 times with a remainder of 9.
Use 1 as the next digit of our solution. 
Result so far: 56701.0
If we take 161 away from 170, we end up with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Step 8:
If we divide 90 by 161, we get 0 and a remainder of 90.
Record the quotient 0 as the next digit in the result. 
Result so far: 56701.0
The remainder is 90 after subtracting 0 from 90.
Since there are no more digits in the dividend, we add a zero to the remainder making it 900, and continue the process.

Going ahead to step 9:
900 divided by 161 is 5 with a remainder of 95.
The number 5 becomes the next digit in our result. 
Result so far: 56701.05
The remainder is 95 after subtracting 805 from 900.
Since there are no more digits in the dividend, we add a zero to the remainder making it 950, and continue the process.

Advancing to step 10:
161 can be fit into 950 5 times, resulting in a remainder of 145.
The number 5 becomes the next digit in our result. 
Result so far: 56701.055
Subtract 805 from 950 to get 145.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1450, and continue the process.

The final outcome is 56701.055, with a leftover of 0.0145.