We're dividing 59508450 by 645 
The aim is to understand the frequency of 645 in 59508450.

Let's proceed to step 1:
5 divided by 645 is 0 with a remainder of 5.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 5, we end up with 5.
Grab the next digit (9) from the dividend, add it to 5, then carry on: 59 / 645

Going ahead to step 2:
645 can be fit into 59 0 times, resulting in a remainder of 59.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 59, we get 59.
Append the next digit (5) from the dividend to 59 and continue with: 595 / 645

On to step 3:
595 divided by 645 is 0 with a remainder of 595.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 595 and we're left with 595.
Bring next digit (0) of the dividend behind the 595 and repeat the process: 5950 / 645

Step 4:
645 goes into 5950 9 times with a remainder of 145.
Use 9 as the next digit of our solution. 
Result so far: 9.0
Subtract 5805 from 5950 to get 145.
Append the next digit (8) from the dividend to 145 and continue with: 1458 / 645

Advancing to step 5:
1458 divided by 645 is 2 with a remainder of 168.
Record the quotient 2 as the next digit in the result. 
Result so far: 92.0
Subtract 1290 from 1458 to get 168.
Include the next digit (4) from the dividend after 168, then repeat: 1684 / 645

On to step 6:
1684 divided by 645 is 2 with a remainder of 394.
Record the quotient 2 as the next digit in the result. 
Result so far: 922.0
Subtracting 1290 from 1684 leaves us with 394.
Grab the next digit (5) from the dividend, add it to 394, then carry on: 3945 / 645

Moving on to step 7:
3945 divided by 645 is 6 with a remainder of 75.
The next digit of our result is 6. 
Result so far: 9226.0
If we take 3870 away from 3945, we end up with 75.
Include the next digit (0) from the dividend after 75, then repeat: 750 / 645

Advancing to step 8:
If we divide 750 by 645, we get 1 and a remainder of 105.
Record the quotient 1 as the next digit in the result. 
Result so far: 92261.0
If we subtract 645 from 750, we get 105.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1050, and continue the process.

Going ahead to step 9:
645 can be fit into 1050 1 times, resulting in a remainder of 405.
The number 1 becomes the next digit in our result. 
Result so far: 92261.1
If we subtract 645 from 1050, we get 405.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4050, and continue the process.

On to step 10:
If we divide 4050 by 645, we get 6 and a remainder of 180.
Put 6 as the next digit of the answer. 
Result so far: 92261.16
The remainder is 180 after subtracting 3870 from 4050.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1800, and continue the process.

Let's proceed to step 11:
645 goes into 1800 2 times with a remainder of 510.
The number 2 becomes the next digit in our result. 
Result so far: 92261.162
The remainder is 510 after subtracting 1290 from 1800.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5100, and continue the process.

Advancing to step 12:
If we divide 5100 by 645, we get 7 and a remainder of 585.
Put 7 as the next digit of the answer. 
Result so far: 92261.1627
Deduct 4515 from 5100 and we're left 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.

Let's proceed to step 13:
If we divide 5850 by 645, we get 9 and a remainder of 45.
Record the quotient 9 as the next digit in the result. 
Result so far: 92261.16279
Subtracting 5805 from 5850 leaves us with 45.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

Advancing to step 14:
When dividing 450 by 645, we get 0 with a remainder of 450.
Use 0 as the next digit of our solution. 
Result so far: 92261.16279
If we take 0 away from 450, we end up 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 15:
When dividing 4500 by 645, we get 6 with a remainder of 630.
Use 6 as the next digit of our solution. 
Result so far: 92261.1627906
If we subtract 3870 from 4500, we get 630.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6300, and continue the process.

Step 16:
6300 divided by 645 is 9 with a remainder of 495.
Record the quotient 9 as the next digit in the result. 
Result so far: 92261.16279069
If we take 5805 away from 6300, we end up 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.

The final outcome is 92261.16279069, with a leftover of 4.95e-07.