7814908 ÷ 90 
The aim is to understand the frequency of 90 in 7814908.

Let's proceed to step 1:
90 can be fit into 7 0 times, resulting in a remainder of 7.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 7, we end up with 7.
Include the next digit (8) from the dividend after 7, then repeat: 78 / 90

Let's proceed to step 2:
If we divide 78 by 90, we get 0 and a remainder of 78.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 78, we end up with 78.
Include the next digit (1) from the dividend after 78, then repeat: 781 / 90

Advancing to step 3:
If we divide 781 by 90, we get 8 and a remainder of 61.
Write down 8 as next digit of the result. 
Result so far: 8.0
Deduct 720 from 781 and we're left with 61.
Grab the next digit (4) from the dividend, add it to 61, then carry on: 614 / 90

On to step 4:
When dividing 614 by 90, we get 6 with a remainder of 74.
Write down 6 as next digit of the result. 
Result so far: 86.0
If we take 540 away from 614, we end up with 74.
Include the next digit (9) from the dividend after 74, then repeat: 749 / 90

On to step 5:
If we divide 749 by 90, we get 8 and a remainder of 29.
Use 8 as the next digit of our solution. 
Result so far: 868.0
Subtract 720 from 749 to get 29.
Grab the next digit (0) from the dividend, add it to 29, then carry on: 290 / 90

Let's proceed to step 6:
90 can be fit into 290 3 times, resulting in a remainder of 20.
Put 3 as the next digit of the answer. 
Result so far: 8683.0
The remainder is 20 after subtracting 270 from 290.
Include the next digit (8) from the dividend after 20, then repeat: 208 / 90

On to step 7:
90 can be fit into 208 2 times, resulting in a remainder of 28.
Use 2 as the next digit of our solution. 
Result so far: 86832.0
Subtract 180 from 208 to get 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

On to step 8:
When dividing 280 by 90, we get 3 with a remainder of 10.
Record the quotient 3 as the next digit in the result. 
Result so far: 86832.3
Subtract 270 from 280 to get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Step 9:
100 divided by 90 is 1 with a remainder of 10.
The number 1 becomes the next digit in our result. 
Result so far: 86832.31
Deduct 90 from 100 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Let's proceed to step 10:
If we divide 100 by 90, we get 1 and a remainder of 10.
Use 1 as the next digit of our solution. 
Result so far: 86832.311
Subtracting 90 from 100 leaves us with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

The final result is 86832.311 with a remainder of 0.001.