99906353 ÷ 648 
The aim is to understand the frequency of 648 in 99906353.

Moving on to step 1:
The number 648 fits into 9 0 times, leaving a remainder of 9.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 9, we get 9.
Append the next digit (9) from the dividend to 9 and continue with: 99 / 648

Advancing to step 2:
If we divide 99 by 648, we get 0 and a remainder of 99.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 99, we get 99.
Bring next digit (9) of the dividend behind the 99 and repeat the process: 999 / 648

Advancing to step 3:
648 can be fit into 999 1 times, resulting in a remainder of 351.
The next digit of our result is 1. 
Result so far: 1.0
Deduct 648 from 999 and we're left with 351.
Fetch the next digit (0) from the dividend, attach it to 351 and continue: 3510 / 648

Moving on to step 4:
If we divide 3510 by 648, we get 5 and a remainder of 270.
Write down 5 as next digit of the result. 
Result so far: 15.0
If we subtract 3240 from 3510, we get 270.
Append the next digit (6) from the dividend to 270 and continue with: 2706 / 648

Let's proceed to step 5:
The number 648 fits into 2706 4 times, leaving a remainder of 114.
Record the quotient 4 as the next digit in the result. 
Result so far: 154.0
Deduct 2592 from 2706 and we're left with 114.
Fetch the next digit (3) from the dividend, attach it to 114 and continue: 1143 / 648

Let's proceed to step 6:
If we divide 1143 by 648, we get 1 and a remainder of 495.
Put 1 as the next digit of the answer. 
Result so far: 1541.0
If we take 648 away from 1143, we end up with 495.
Bring next digit (5) of the dividend behind the 495 and repeat the process: 4955 / 648

Advancing to step 7:
648 can be fit into 4955 7 times, resulting in a remainder of 419.
Put 7 as the next digit of the answer. 
Result so far: 15417.0
Subtracting 4536 from 4955 leaves us with 419.
Take the next digit (3) from the dividend and append it to 419, then repeat: 4193 / 648

Let's proceed to step 8:
When dividing 4193 by 648, we get 6 with a remainder of 305.
The next digit of our result is 6. 
Result so far: 154176.0
Subtract 3888 from 4193 to get 305.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3050, and continue the process.

Moving on to step 9:
If we divide 3050 by 648, we get 4 and a remainder of 458.
Record the quotient 4 as the next digit in the result. 
Result so far: 154176.4
If we take 2592 away from 3050, we end up with 458.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4580, and continue the process.

Step 10:
648 goes into 4580 7 times with a remainder of 44.
Record the quotient 7 as the next digit in the result. 
Result so far: 154176.47
If we take 4536 away from 4580, we end up with 44.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

Going ahead to step 11:
648 can be fit into 440 0 times, resulting in a remainder of 440.
Put 0 as the next digit of the answer. 
Result so far: 154176.47
Subtracting 0 from 440 leaves us with 440.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4400, and continue the process.

On to step 12:
The number 648 fits into 4400 6 times, leaving a remainder of 512.
The number 6 becomes the next digit in our result. 
Result so far: 154176.4706
Subtract 3888 from 4400 to get 512.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5120, and continue the process.

On to step 13:
5120 divided by 648 is 7 with a remainder of 584.
Record the quotient 7 as the next digit in the result. 
Result so far: 154176.47067
Subtracting 4536 from 5120 leaves us with 584.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5840, and continue the process.

On to step 14:
If we divide 5840 by 648, we get 9 and a remainder of 8.
Write down 9 as next digit of the result. 
Result so far: 154176.470679
Subtract 5832 from 5840 to get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

On to step 15:
If we divide 80 by 648, we get 0 and a remainder of 80.
The next digit of our result is 0. 
Result so far: 154176.470679
Subtracting 0 from 80 leaves us with 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Going ahead to step 16:
648 can be fit into 800 1 times, resulting in a remainder of 152.
The number 1 becomes the next digit in our result. 
Result so far: 154176.47067901
Subtracting 648 from 800 leaves us with 152.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1520, and continue the process.

In conclusion, the division gives 154176.47067901 with a balance of 1.52e-07.