45462891 divided by 990 
The aim is to understand the frequency of 990 in 45462891.

On to step 1:
4 divided by 990 is 0 with a remainder of 4.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 4 after subtracting 0 from 4.
Append the next digit (5) from the dividend to 4 and continue with: 45 / 990

Going ahead to step 2:
990 can be fit into 45 0 times, resulting in a remainder of 45.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 45 leaves us with 45.
Grab the next digit (4) from the dividend, add it to 45, then carry on: 454 / 990

Let's proceed to step 3:
990 can be fit into 454 0 times, resulting in a remainder of 454.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 454 leaves us with 454.
Include the next digit (6) from the dividend after 454, then repeat: 4546 / 990

Step 4:
If we divide 4546 by 990, we get 4 and a remainder of 586.
The number 4 becomes the next digit in our result. 
Result so far: 4.0
Deduct 3960 from 4546 and we're left with 586.
Append the next digit (2) from the dividend to 586 and continue with: 5862 / 990

Let's proceed to step 5:
990 goes into 5862 5 times with a remainder of 912.
The number 5 becomes the next digit in our result. 
Result so far: 45.0
Subtracting 4950 from 5862 leaves us with 912.
Grab the next digit (8) from the dividend, add it to 912, then carry on: 9128 / 990

On to step 6:
The number 990 fits into 9128 9 times, leaving a remainder of 218.
Record the quotient 9 as the next digit in the result. 
Result so far: 459.0
If we subtract 8910 from 9128, we get 218.
Take the next digit (9) from the dividend and append it to 218, then repeat: 2189 / 990

Let's proceed to step 7:
990 can be fit into 2189 2 times, resulting in a remainder of 209.
The number 2 becomes the next digit in our result. 
Result so far: 4592.0
Subtracting 1980 from 2189 leaves us with 209.
Include the next digit (1) from the dividend after 209, then repeat: 2091 / 990

Going ahead to step 8:
2091 divided by 990 is 2 with a remainder of 111.
Use 2 as the next digit of our solution. 
Result so far: 45922.0
Deduct 1980 from 2091 and we're left with 111.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1110, and continue the process.

Moving on to step 9:
The number 990 fits into 1110 1 times, leaving a remainder of 120.
Record the quotient 1 as the next digit in the result. 
Result so far: 45922.1
Subtracting 990 from 1110 leaves us with 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1200, and continue the process.

Step 10:
If we divide 1200 by 990, we get 1 and a remainder of 210.
Record the quotient 1 as the next digit in the result. 
Result so far: 45922.11
If we subtract 990 from 1200, we get 210.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2100, and continue the process.

The final result is 45922.11 with a remainder of 0.21.