91889121 ÷ 10 
The aim is to understand the frequency of 10 in 91889121.

Let's proceed to step 1:
10 can be fit into 9 0 times, resulting in a remainder of 9.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 9 and we're left with 9.
Bring next digit (1) of the dividend behind the 9 and repeat the process: 91 / 10

Going ahead to step 2:
When dividing 91 by 10, we get 9 with a remainder of 1.
The number 9 becomes the next digit in our result. 
Result so far: 9.0
Subtract 90 from 91 to get 1.
Bring next digit (8) of the dividend behind the 1 and repeat the process: 18 / 10

Step 3:
18 divided by 10 is 1 with a remainder of 8.
The next digit of our result is 1. 
Result so far: 91.0
Subtracting 10 from 18 leaves us with 8.
Fetch the next digit (8) from the dividend, attach it to 8 and continue: 88 / 10

Step 4:
88 divided by 10 is 8 with a remainder of 8.
Write down 8 as next digit of the result. 
Result so far: 918.0
Deduct 80 from 88 and we're left with 8.
Append the next digit (9) from the dividend to 8 and continue with: 89 / 10

On to step 5:
89 divided by 10 is 8 with a remainder of 9.
The number 8 becomes the next digit in our result. 
Result so far: 9188.0
Deduct 80 from 89 and we're left with 9.
Take the next digit (1) from the dividend and append it to 9, then repeat: 91 / 10

Going ahead to step 6:
10 can be fit into 91 9 times, resulting in a remainder of 1.
Write down 9 as next digit of the result. 
Result so far: 91889.0
If we subtract 90 from 91, we get 1.
Bring next digit (2) of the dividend behind the 1 and repeat the process: 12 / 10

Going ahead to step 7:
10 can be fit into 12 1 times, resulting in a remainder of 2.
Put 1 as the next digit of the answer. 
Result so far: 918891.0
The remainder is 2 after subtracting 10 from 12.
Grab the next digit (1) from the dividend, add it to 2, then carry on: 21 / 10

On to step 8:
10 can be fit into 21 2 times, resulting in a remainder of 1.
Write down 2 as next digit of the result. 
Result so far: 9188912.0
If we take 20 away from 21, we end up with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Moving on to step 9:
10 goes into 10 1 times with a remainder of 0.
Use 1 as the next digit of our solution. 
Result so far: 9188912.1
Subtracting 10 from 10 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

On to step 10:
0 divided by 10 is 0 with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 9188912.1
Deduct 0 from 0 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Moving on to step 11:
10 can be fit into 0 0 times, resulting in a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 9188912.1
Subtracting 0 from 0 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final outcome is 9188912.1, with a leftover of 0.0.