We're dividing 90641365 by 621 
The aim is to understand the frequency of 621 in 90641365.

Advancing to step 1:
If we divide 9 by 621, we get 0 and a remainder of 9.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 9 to get 9.
Fetch the next digit (0) from the dividend, attach it to 9 and continue: 90 / 621

On to step 2:
621 goes into 90 0 times with a remainder of 90.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 90 to get 90.
Bring next digit (6) of the dividend behind the 90 and repeat the process: 906 / 621

Advancing to step 3:
The number 621 fits into 906 1 times, leaving a remainder of 285.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Subtract 621 from 906 to get 285.
Include the next digit (4) from the dividend after 285, then repeat: 2854 / 621

Step 4:
The number 621 fits into 2854 4 times, leaving a remainder of 370.
Write down 4 as next digit of the result. 
Result so far: 14.0
Subtract 2484 from 2854 to get 370.
Fetch the next digit (1) from the dividend, attach it to 370 and continue: 3701 / 621

Step 5:
621 goes into 3701 5 times with a remainder of 596.
Record the quotient 5 as the next digit in the result. 
Result so far: 145.0
If we subtract 3105 from 3701, we get 596.
Bring next digit (3) of the dividend behind the 596 and repeat the process: 5963 / 621

On to step 6:
5963 divided by 621 is 9 with a remainder of 374.
The next digit of our result is 9. 
Result so far: 1459.0
Subtracting 5589 from 5963 leaves us with 374.
Include the next digit (6) from the dividend after 374, then repeat: 3746 / 621

Moving on to step 7:
621 goes into 3746 6 times with a remainder of 20.
Use 6 as the next digit of our solution. 
Result so far: 14596.0
Subtract 3726 from 3746 to get 20.
Include the next digit (5) from the dividend after 20, then repeat: 205 / 621

Advancing to step 8:
621 can be fit into 205 0 times, resulting in a remainder of 205.
The next digit of our result is 0. 
Result so far: 145960.0
The remainder is 205 after subtracting 0 from 205.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2050, and continue the process.

On to step 9:
When dividing 2050 by 621, we get 3 with a remainder of 187.
Put 3 as the next digit of the answer. 
Result so far: 145960.3
Subtract 1863 from 2050 to get 187.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1870, and continue the process.

Moving on to step 10:
1870 divided by 621 is 3 with a remainder of 7.
Use 3 as the next digit of our solution. 
Result so far: 145960.33
Subtracting 1863 from 1870 leaves us with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

In conclusion, the division gives 145960.33 with a balance of 0.007.