621952 ÷ 45 
The aim is to understand the frequency of 45 in 621952.

Moving on to step 1:
When dividing 6 by 45, we get 0 with a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Append the next digit (2) from the dividend to 6 and continue with: 62 / 45

Going ahead to step 2:
45 can be fit into 62 1 times, resulting in a remainder of 17.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Subtract 45 from 62 to get 17.
Take the next digit (1) from the dividend and append it to 17, then repeat: 171 / 45

Moving on to step 3:
When dividing 171 by 45, we get 3 with a remainder of 36.
The next digit of our result is 3. 
Result so far: 13.0
If we take 135 away from 171, we end up with 36.
Bring next digit (9) of the dividend behind the 36 and repeat the process: 369 / 45

On to step 4:
The number 45 fits into 369 8 times, leaving a remainder of 9.
Write down 8 as next digit of the result. 
Result so far: 138.0
Deduct 360 from 369 and we're left with 9.
Append the next digit (5) from the dividend to 9 and continue with: 95 / 45

Advancing to step 5:
45 goes into 95 2 times with a remainder of 5.
The number 2 becomes the next digit in our result. 
Result so far: 1382.0
If we subtract 90 from 95, we get 5.
Take the next digit (2) from the dividend and append it to 5, then repeat: 52 / 45

Step 6:
45 goes into 52 1 times with a remainder of 7.
The number 1 becomes the next digit in our result. 
Result so far: 13821.0
Subtracting 45 from 52 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.

Let's proceed to step 7:
45 can be fit into 70 1 times, resulting in a remainder of 25.
Write down 1 as next digit of the result. 
Result so far: 13821.1
Subtracting 45 from 70 leaves us with 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

On to step 8:
250 divided by 45 is 5 with a remainder of 25.
The next digit of our result is 5. 
Result so far: 13821.15
The remainder is 25 after subtracting 225 from 250.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

Let's proceed to step 9:
If we divide 250 by 45, we get 5 and a remainder of 25.
Write down 5 as next digit of the result. 
Result so far: 13821.155
The remainder is 25 after subtracting 225 from 250.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

The final outcome is 13821.155, with a leftover of 0.0025.