We divide 20938380 by 648
The aim is to understand the frequency of 648 in 20938380.

Moving on to step 1:
648 goes into 2 0 times with a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 2 after subtracting 0 from 2.
Append the next digit (0) from the dividend to 2 and continue with: 20 / 648

On to step 2:
If we divide 20 by 648, we get 0 and a remainder of 20.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 20 to get 20.
Grab the next digit (9) from the dividend, add it to 20, then carry on: 209 / 648

Advancing to step 3:
When dividing 209 by 648, we get 0 with a remainder of 209.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 209 to get 209.
Grab the next digit (3) from the dividend, add it to 209, then carry on: 2093 / 648

Going ahead to step 4:
2093 divided by 648 is 3 with a remainder of 149.
Record the quotient 3 as the next digit in the result. 
Result so far: 3.0
The remainder is 149 after subtracting 1944 from 2093.
Bring next digit (8) of the dividend behind the 149 and repeat the process: 1498 / 648

On to step 5:
648 goes into 1498 2 times with a remainder of 202.
The next digit of our result is 2. 
Result so far: 32.0
Deduct 1296 from 1498 and we're left with 202.
Grab the next digit (3) from the dividend, add it to 202, then carry on: 2023 / 648

Going ahead to step 6:
If we divide 2023 by 648, we get 3 and a remainder of 79.
Record the quotient 3 as the next digit in the result. 
Result so far: 323.0
The remainder is 79 after subtracting 1944 from 2023.
Include the next digit (8) from the dividend after 79, then repeat: 798 / 648

Step 7:
When dividing 798 by 648, we get 1 with a remainder of 150.
Write down 1 as next digit of the result. 
Result so far: 3231.0
If we subtract 648 from 798, we get 150.
Include the next digit (0) from the dividend after 150, then repeat: 1500 / 648

Let's proceed to step 8:
The number 648 fits into 1500 2 times, leaving a remainder of 204.
The next digit of our result is 2. 
Result so far: 32312.0
If we take 1296 away from 1500, we end up with 204.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2040, and continue the process.

Going ahead to step 9:
2040 divided by 648 is 3 with a remainder of 96.
The number 3 becomes the next digit in our result. 
Result so far: 32312.3
Deduct 1944 from 2040 and we're left with 96.
Since there are no more digits in the dividend, we add a zero to the remainder making it 960, and continue the process.

Step 10:
648 goes into 960 1 times with a remainder of 312.
Record the quotient 1 as the next digit in the result. 
Result so far: 32312.31
Subtract 648 from 960 to get 312.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3120, and continue the process.

Let's proceed to step 11:
The number 648 fits into 3120 4 times, leaving a remainder of 528.
Use 4 as the next digit of our solution. 
Result so far: 32312.314
If we take 2592 away from 3120, we end up with 528.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5280, and continue the process.

Step 12:
5280 divided by 648 is 8 with a remainder of 96.
Put 8 as the next digit of the answer. 
Result so far: 32312.3148
Subtracting 5184 from 5280 leaves us with 96.
Since there are no more digits in the dividend, we add a zero to the remainder making it 960, and continue the process.

Going ahead to step 13:
If we divide 960 by 648, we get 1 and a remainder of 312.
The number 1 becomes the next digit in our result. 
Result so far: 32312.31481
The remainder is 312 after subtracting 648 from 960.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3120, and continue the process.

On to step 14:
648 can be fit into 3120 4 times, resulting in a remainder of 528.
The number 4 becomes the next digit in our result. 
Result so far: 32312.314814
The remainder is 528 after subtracting 2592 from 3120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5280, and continue the process.

Step 15:
The number 648 fits into 5280 8 times, leaving a remainder of 96.
Put 8 as the next digit of the answer. 
Result so far: 32312.3148148
Subtract 5184 from 5280 to get 96.
Since there are no more digits in the dividend, we add a zero to the remainder making it 960, and continue the process.

Let's proceed to step 16:
960 divided by 648 is 1 with a remainder of 312.
Record the quotient 1 as the next digit in the result. 
Result so far: 32312.31481481
Subtracting 648 from 960 leaves us with 312.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3120, and continue the process.

After the division, we end up with 32312.31481481 and a remainder of 3.12e-07.