We look at the division of 59054646 by 645 
The aim is to understand the frequency of 645 in 59054646.

Let's proceed to step 1:
645 goes into 5 0 times with a remainder of 5.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 5 leaves us with 5.
Fetch the next digit (9) from the dividend, attach it to 5 and continue: 59 / 645

Let's proceed to step 2:
When dividing 59 by 645, we get 0 with a remainder of 59.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 59 to get 59.
Fetch the next digit (0) from the dividend, attach it to 59 and continue: 590 / 645

Moving on to step 3:
645 can be fit into 590 0 times, resulting in a remainder of 590.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 590, we get 590.
Bring next digit (5) of the dividend behind the 590 and repeat the process: 5905 / 645

Let's proceed to step 4:
5905 divided by 645 is 9 with a remainder of 100.
Put 9 as the next digit of the answer. 
Result so far: 9.0
The remainder is 100 after subtracting 5805 from 5905.
Append the next digit (4) from the dividend to 100 and continue with: 1004 / 645

Moving on to step 5:
If we divide 1004 by 645, we get 1 and a remainder of 359.
Use 1 as the next digit of our solution. 
Result so far: 91.0
Subtracting 645 from 1004 leaves us with 359.
Append the next digit (6) from the dividend to 359 and continue with: 3596 / 645

Moving on to step 6:
645 can be fit into 3596 5 times, resulting in a remainder of 371.
Record the quotient 5 as the next digit in the result. 
Result so far: 915.0
Subtract 3225 from 3596 to get 371.
Fetch the next digit (4) from the dividend, attach it to 371 and continue: 3714 / 645

Let's proceed to step 7:
When dividing 3714 by 645, we get 5 with a remainder of 489.
The number 5 becomes the next digit in our result. 
Result so far: 9155.0
Subtract 3225 from 3714 to get 489.
Grab the next digit (6) from the dividend, add it to 489, then carry on: 4896 / 645

Step 8:
When dividing 4896 by 645, we get 7 with a remainder of 381.
Record the quotient 7 as the next digit in the result. 
Result so far: 91557.0
If we subtract 4515 from 4896, we get 381.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3810, and continue the process.

Step 9:
3810 divided by 645 is 5 with a remainder of 585.
The next digit of our result is 5. 
Result so far: 91557.5
If we take 3225 away from 3810, we end up with 585.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5850, and continue the process.

Step 10:
5850 divided by 645 is 9 with a remainder of 45.
The number 9 becomes the next digit in our result. 
Result so far: 91557.59
Subtract 5805 from 5850 to get 45.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

Going ahead to step 11:
645 can be fit into 450 0 times, resulting in a remainder of 450.
The next digit of our result is 0. 
Result so far: 91557.59
Subtracting 0 from 450 leaves us with 450.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4500, and continue the process.

Step 12:
645 goes into 4500 6 times with a remainder of 630.
Write down 6 as next digit of the result. 
Result so far: 91557.5906
The remainder is 630 after subtracting 3870 from 4500.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6300, and continue the process.

On to step 13:
The number 645 fits into 6300 9 times, leaving a remainder of 495.
Record the quotient 9 as the next digit in the result. 
Result so far: 91557.59069
Deduct 5805 from 6300 and we're left with 495.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4950, and continue the process.

Step 14:
If we divide 4950 by 645, we get 7 and a remainder of 435.
Use 7 as the next digit of our solution. 
Result so far: 91557.590697
If we subtract 4515 from 4950, we get 435.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4350, and continue the process.

Going ahead to step 15:
If we divide 4350 by 645, we get 6 and a remainder of 480.
Use 6 as the next digit of our solution. 
Result so far: 91557.5906976
If we subtract 3870 from 4350, we get 480.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4800, and continue the process.

Advancing to step 16:
645 goes into 4800 7 times with a remainder of 285.
The next digit of our result is 7. 
Result so far: 91557.59069767
If we subtract 4515 from 4800, we get 285.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2850, and continue the process.

The final result is 91557.59069767 with a remainder of 2.85e-07.