We look at the division of 99493197 by 645 
The aim is to understand the frequency of 645 in 99493197.

Advancing to step 1:
645 can be fit into 9 0 times, resulting in a remainder of 9.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 9 after subtracting 0 from 9.
Append the next digit (9) from the dividend to 9 and continue with: 99 / 645

Let's proceed to step 2:
When dividing 99 by 645, we get 0 with a remainder of 99.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 99, we end up with 99.
Fetch the next digit (4) from the dividend, attach it to 99 and continue: 994 / 645

Advancing to step 3:
994 divided by 645 is 1 with a remainder of 349.
Write down 1 as next digit of the result. 
Result so far: 1.0
The remainder is 349 after subtracting 645 from 994.
Append the next digit (9) from the dividend to 349 and continue with: 3499 / 645

On to step 4:
3499 divided by 645 is 5 with a remainder of 274.
The number 5 becomes the next digit in our result. 
Result so far: 15.0
Subtracting 3225 from 3499 leaves us with 274.
Grab the next digit (3) from the dividend, add it to 274, then carry on: 2743 / 645

Let's proceed to step 5:
2743 divided by 645 is 4 with a remainder of 163.
The number 4 becomes the next digit in our result. 
Result so far: 154.0
If we take 2580 away from 2743, we end up with 163.
Take the next digit (1) from the dividend and append it to 163, then repeat: 1631 / 645

Going ahead to step 6:
When dividing 1631 by 645, we get 2 with a remainder of 341.
Write down 2 as next digit of the result. 
Result so far: 1542.0
If we subtract 1290 from 1631, we get 341.
Grab the next digit (9) from the dividend, add it to 341, then carry on: 3419 / 645

Let's proceed to step 7:
When dividing 3419 by 645, we get 5 with a remainder of 194.
The number 5 becomes the next digit in our result. 
Result so far: 15425.0
Subtracting 3225 from 3419 leaves us with 194.
Take the next digit (7) from the dividend and append it to 194, then repeat: 1947 / 645

Advancing to step 8:
645 goes into 1947 3 times with a remainder of 12.
Record the quotient 3 as the next digit in the result. 
Result so far: 154253.0
Deduct 1935 from 1947 and we're left with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Step 9:
If we divide 120 by 645, we get 0 and a remainder of 120.
The next digit of our result is 0. 
Result so far: 154253.0
The remainder is 120 after subtracting 0 from 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1200, and continue the process.

Step 10:
When dividing 1200 by 645, we get 1 with a remainder of 555.
Write down 1 as next digit of the result. 
Result so far: 154253.01
Subtract 645 from 1200 to get 555.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5550, and continue the process.

On to step 11:
If we divide 5550 by 645, we get 8 and a remainder of 390.
Use 8 as the next digit of our solution. 
Result so far: 154253.018
The remainder is 390 after subtracting 5160 from 5550.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3900, and continue the process.

Let's proceed to step 12:
When dividing 3900 by 645, we get 6 with a remainder of 30.
Record the quotient 6 as the next digit in the result. 
Result so far: 154253.0186
Subtract 3870 from 3900 to get 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Let's proceed to step 13:
If we divide 300 by 645, we get 0 and a remainder of 300.
Record the quotient 0 as the next digit in the result. 
Result so far: 154253.0186
The remainder is 300 after subtracting 0 from 300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3000, and continue the process.

Moving on to step 14:
When dividing 3000 by 645, we get 4 with a remainder of 420.
Use 4 as the next digit of our solution. 
Result so far: 154253.018604
If we subtract 2580 from 3000, we get 420.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4200, and continue the process.

Going ahead to step 15:
4200 divided by 645 is 6 with a remainder of 330.
Put 6 as the next digit of the answer. 
Result so far: 154253.0186046
If we subtract 3870 from 4200, we get 330.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3300, and continue the process.

Let's proceed to step 16:
645 can be fit into 3300 5 times, resulting in a remainder of 75.
Write down 5 as next digit of the result. 
Result so far: 154253.01860465
If we subtract 3225 from 3300, we get 75.
Since there are no more digits in the dividend, we add a zero to the remainder making it 750, and continue the process.

After the division, we end up with 154253.01860465 and a remainder of 7.5e-08.