66655408 ÷ 838 
The aim is to understand the frequency of 838 in 66655408.

Advancing to step 1:
The number 838 fits into 6 0 times, leaving a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 6 leaves us with 6.
Grab the next digit (6) from the dividend, add it to 6, then carry on: 66 / 838

Going ahead to step 2:
When dividing 66 by 838, we get 0 with a remainder of 66.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 66 to get 66.
Fetch the next digit (6) from the dividend, attach it to 66 and continue: 666 / 838

Let's proceed to step 3:
838 goes into 666 0 times with a remainder of 666.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 666, we get 666.
Bring next digit (5) of the dividend behind the 666 and repeat the process: 6665 / 838

Step 4:
838 goes into 6665 7 times with a remainder of 799.
Use 7 as the next digit of our solution. 
Result so far: 7.0
Subtract 5866 from 6665 to get 799.
Bring next digit (5) of the dividend behind the 799 and repeat the process: 7995 / 838

On to step 5:
838 goes into 7995 9 times with a remainder of 453.
Use 9 as the next digit of our solution. 
Result so far: 79.0
Subtract 7542 from 7995 to get 453.
Grab the next digit (4) from the dividend, add it to 453, then carry on: 4534 / 838

On to step 6:
The number 838 fits into 4534 5 times, leaving a remainder of 344.
Put 5 as the next digit of the answer. 
Result so far: 795.0
Subtract 4190 from 4534 to get 344.
Fetch the next digit (0) from the dividend, attach it to 344 and continue: 3440 / 838

Step 7:
838 can be fit into 3440 4 times, resulting in a remainder of 88.
Write down 4 as next digit of the result. 
Result so far: 7954.0
Deduct 3352 from 3440 and we're left with 88.
Append the next digit (8) from the dividend to 88 and continue with: 888 / 838

Let's proceed to step 8:
888 divided by 838 is 1 with a remainder of 50.
Record the quotient 1 as the next digit in the result. 
Result so far: 79541.0
The remainder is 50 after subtracting 838 from 888.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Step 9:
If we divide 500 by 838, we get 0 and a remainder of 500.
The number 0 becomes the next digit in our result. 
Result so far: 79541.0
Subtract 0 from 500 to get 500.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5000, and continue the process.

Advancing to step 10:
If we divide 5000 by 838, we get 5 and a remainder of 810.
Write down 5 as next digit of the result. 
Result so far: 79541.05
If we subtract 4190 from 5000, we get 810.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8100, and continue the process.

Advancing to step 11:
838 can be fit into 8100 9 times, resulting in a remainder of 558.
The number 9 becomes the next digit in our result. 
Result so far: 79541.059
If we subtract 7542 from 8100, we get 558.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5580, and continue the process.

Advancing to step 12:
838 can be fit into 5580 6 times, resulting in a remainder of 552.
Record the quotient 6 as the next digit in the result. 
Result so far: 79541.0596
Subtracting 5028 from 5580 leaves us with 552.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5520, and continue the process.

Step 13:
When dividing 5520 by 838, we get 6 with a remainder of 492.
The number 6 becomes the next digit in our result. 
Result so far: 79541.05966
Subtract 5028 from 5520 to get 492.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4920, and continue the process.

The final result is 79541.05966 with a remainder of 0.000492.