We look at the division of 66089460 by 993 
The aim is to understand the frequency of 993 in 66089460.

On to step 1:
993 goes into 6 0 times with a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Include the next digit (6) from the dividend after 6, then repeat: 66 / 993

Moving on to step 2:
If we divide 66 by 993, we get 0 and a remainder of 66.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 66 leaves us with 66.
Include the next digit (0) from the dividend after 66, then repeat: 660 / 993

Let's proceed to step 3:
660 divided by 993 is 0 with a remainder of 660.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 660 to get 660.
Append the next digit (8) from the dividend to 660 and continue with: 6608 / 993

Moving on to step 4:
993 can be fit into 6608 6 times, resulting in a remainder of 650.
The number 6 becomes the next digit in our result. 
Result so far: 6.0
The remainder is 650 after subtracting 5958 from 6608.
Bring next digit (9) of the dividend behind the 650 and repeat the process: 6509 / 993

On to step 5:
The number 993 fits into 6509 6 times, leaving a remainder of 551.
Put 6 as the next digit of the answer. 
Result so far: 66.0
If we take 5958 away from 6509, we end up with 551.
Include the next digit (4) from the dividend after 551, then repeat: 5514 / 993

Let's proceed to step 6:
When dividing 5514 by 993, we get 5 with a remainder of 549.
Record the quotient 5 as the next digit in the result. 
Result so far: 665.0
The remainder is 549 after subtracting 4965 from 5514.
Take the next digit (6) from the dividend and append it to 549, then repeat: 5496 / 993

Step 7:
5496 divided by 993 is 5 with a remainder of 531.
Use 5 as the next digit of our solution. 
Result so far: 6655.0
If we subtract 4965 from 5496, we get 531.
Fetch the next digit (0) from the dividend, attach it to 531 and continue: 5310 / 993

Moving on to step 8:
5310 divided by 993 is 5 with a remainder of 345.
Write down 5 as next digit of the result. 
Result so far: 66555.0
If we subtract 4965 from 5310, we get 345.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3450, and continue the process.

Advancing to step 9:
993 can be fit into 3450 3 times, resulting in a remainder of 471.
Write down 3 as next digit of the result. 
Result so far: 66555.3
Subtract 2979 from 3450 to get 471.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4710, and continue the process.

Going ahead to step 10:
When dividing 4710 by 993, we get 4 with a remainder of 738.
The next digit of our result is 4. 
Result so far: 66555.34
The remainder is 738 after subtracting 3972 from 4710.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7380, and continue the process.

On to step 11:
993 goes into 7380 7 times with a remainder of 429.
The number 7 becomes the next digit in our result. 
Result so far: 66555.347
If we subtract 6951 from 7380, we get 429.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4290, and continue the process.

Step 12:
993 can be fit into 4290 4 times, resulting in a remainder of 318.
Use 4 as the next digit of our solution. 
Result so far: 66555.3474
The remainder is 318 after subtracting 3972 from 4290.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3180, and continue the process.

Let's proceed to step 13:
993 goes into 3180 3 times with a remainder of 201.
Write down 3 as next digit of the result. 
Result so far: 66555.34743
If we subtract 2979 from 3180, we get 201.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2010, and continue the process.

Going ahead to step 14:
If we divide 2010 by 993, we get 2 and a remainder of 24.
Use 2 as the next digit of our solution. 
Result so far: 66555.347432
If we subtract 1986 from 2010, we get 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Let's proceed to step 15:
240 divided by 993 is 0 with a remainder of 240.
Use 0 as the next digit of our solution. 
Result so far: 66555.347432
The remainder is 240 after subtracting 0 from 240.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2400, and continue the process.

Let's proceed to step 16:
The number 993 fits into 2400 2 times, leaving a remainder of 414.
Record the quotient 2 as the next digit in the result. 
Result so far: 66555.34743202
Subtract 1986 from 2400 to get 414.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4140, and continue the process.

After the division, we end up with 66555.34743202 and a remainder of 4.14e-07.