Let's divide 626396 by 90
The aim is to understand the frequency of 90 in 626396.

Moving on to step 1:
90 can be fit into 6 0 times, resulting in a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 6 and we're left with 6.
Grab the next digit (2) from the dividend, add it to 6, then carry on: 62 / 90

Step 2:
When dividing 62 by 90, we get 0 with a remainder of 62.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 62 and we're left with 62.
Take the next digit (6) from the dividend and append it to 62, then repeat: 626 / 90

On to step 3:
When dividing 626 by 90, we get 6 with a remainder of 86.
Use 6 as the next digit of our solution. 
Result so far: 6.0
Subtracting 540 from 626 leaves us with 86.
Fetch the next digit (3) from the dividend, attach it to 86 and continue: 863 / 90

Step 4:
90 goes into 863 9 times with a remainder of 53.
The next digit of our result is 9. 
Result so far: 69.0
If we subtract 810 from 863, we get 53.
Bring next digit (9) of the dividend behind the 53 and repeat the process: 539 / 90

Going ahead to step 5:
90 goes into 539 5 times with a remainder of 89.
The number 5 becomes the next digit in our result. 
Result so far: 695.0
If we subtract 450 from 539, we get 89.
Bring next digit (6) of the dividend behind the 89 and repeat the process: 896 / 90

On to step 6:
If we divide 896 by 90, we get 9 and a remainder of 86.
Use 9 as the next digit of our solution. 
Result so far: 6959.0
The remainder is 86 after subtracting 810 from 896.
Since there are no more digits in the dividend, we add a zero to the remainder making it 860, and continue the process.

Let's proceed to step 7:
If we divide 860 by 90, we get 9 and a remainder of 50.
Record the quotient 9 as the next digit in the result. 
Result so far: 6959.9
If we take 810 away from 860, we end up with 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Step 8:
The number 90 fits into 500 5 times, leaving a remainder of 50.
Write down 5 as next digit of the result. 
Result so far: 6959.95
Deduct 450 from 500 and we're left with 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Advancing to step 9:
90 goes into 500 5 times with a remainder of 50.
The number 5 becomes the next digit in our result. 
Result so far: 6959.955
Deduct 450 from 500 and we're left with 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

The final outcome is 6959.955, with a leftover of 0.005.