66549680 ÷ 356 
The aim is to understand the frequency of 356 in 66549680.

On to step 1:
356 goes into 6 0 times with a remainder of 6.
Write down 0 as next digit of the result. 
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 / 356

Step 2:
356 goes into 66 0 times with a remainder of 66.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 66 after subtracting 0 from 66.
Fetch the next digit (5) from the dividend, attach it to 66 and continue: 665 / 356

Step 3:
356 goes into 665 1 times with a remainder of 309.
Put 1 as the next digit of the answer. 
Result so far: 1.0
The remainder is 309 after subtracting 356 from 665.
Bring next digit (4) of the dividend behind the 309 and repeat the process: 3094 / 356

Let's proceed to step 4:
The number 356 fits into 3094 8 times, leaving a remainder of 246.
The number 8 becomes the next digit in our result. 
Result so far: 18.0
If we subtract 2848 from 3094, we get 246.
Grab the next digit (9) from the dividend, add it to 246, then carry on: 2469 / 356

On to step 5:
356 goes into 2469 6 times with a remainder of 333.
Use 6 as the next digit of our solution. 
Result so far: 186.0
Subtract 2136 from 2469 to get 333.
Grab the next digit (6) from the dividend, add it to 333, then carry on: 3336 / 356

Let's proceed to step 6:
356 goes into 3336 9 times with a remainder of 132.
Write down 9 as next digit of the result. 
Result so far: 1869.0
If we subtract 3204 from 3336, we get 132.
Fetch the next digit (8) from the dividend, attach it to 132 and continue: 1328 / 356

Advancing to step 7:
If we divide 1328 by 356, we get 3 and a remainder of 260.
The number 3 becomes the next digit in our result. 
Result so far: 18693.0
If we subtract 1068 from 1328, we get 260.
Bring next digit (0) of the dividend behind the 260 and repeat the process: 2600 / 356

On to step 8:
356 can be fit into 2600 7 times, resulting in a remainder of 108.
Write down 7 as next digit of the result. 
Result so far: 186937.0
Subtract 2492 from 2600 to get 108.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1080, and continue the process.

Going ahead to step 9:
When dividing 1080 by 356, we get 3 with a remainder of 12.
Record the quotient 3 as the next digit in the result. 
Result so far: 186937.3
Deduct 1068 from 1080 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.

Moving on to step 10:
The number 356 fits into 120 0 times, leaving a remainder of 120.
Use 0 as the next digit of our solution. 
Result so far: 186937.3
Subtracting 0 from 120 leaves us with 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1200, and continue the process.

On to step 11:
1200 divided by 356 is 3 with a remainder of 132.
Write down 3 as next digit of the result. 
Result so far: 186937.303
If we subtract 1068 from 1200, we get 132.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1320, and continue the process.

Moving on to step 12:
356 goes into 1320 3 times with a remainder of 252.
Record the quotient 3 as the next digit in the result. 
Result so far: 186937.3033
If we subtract 1068 from 1320, we get 252.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2520, and continue the process.

After the division, we end up with 186937.3033 and a remainder of 0.00252.