We look at the division of 30987612 by 669 
The aim is to understand the frequency of 669 in 30987612.

On to step 1:
When dividing 3 by 669, we get 0 with a remainder of 3.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 3, we get 3.
Take the next digit (0) from the dividend and append it to 3, then repeat: 30 / 669

Moving on to step 2:
If we divide 30 by 669, we get 0 and a remainder of 30.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 30 to get 30.
Include the next digit (9) from the dividend after 30, then repeat: 309 / 669

Advancing to step 3:
The number 669 fits into 309 0 times, leaving a remainder of 309.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 309, we get 309.
Fetch the next digit (8) from the dividend, attach it to 309 and continue: 3098 / 669

Moving on to step 4:
If we divide 3098 by 669, we get 4 and a remainder of 422.
The next digit of our result is 4. 
Result so far: 4.0
If we take 2676 away from 3098, we end up with 422.
Fetch the next digit (7) from the dividend, attach it to 422 and continue: 4227 / 669

Going ahead to step 5:
669 can be fit into 4227 6 times, resulting in a remainder of 213.
Put 6 as the next digit of the answer. 
Result so far: 46.0
Deduct 4014 from 4227 and we're left with 213.
Append the next digit (6) from the dividend to 213 and continue with: 2136 / 669

Going ahead to step 6:
When dividing 2136 by 669, we get 3 with a remainder of 129.
The number 3 becomes the next digit in our result. 
Result so far: 463.0
Subtracting 2007 from 2136 leaves us with 129.
Grab the next digit (1) from the dividend, add it to 129, then carry on: 1291 / 669

Going ahead to step 7:
1291 divided by 669 is 1 with a remainder of 622.
Record the quotient 1 as the next digit in the result. 
Result so far: 4631.0
Subtract 669 from 1291 to get 622.
Append the next digit (2) from the dividend to 622 and continue with: 6222 / 669

On to step 8:
669 goes into 6222 9 times with a remainder of 201.
Write down 9 as next digit of the result. 
Result so far: 46319.0
If we take 6021 away from 6222, we end up with 201.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2010, and continue the process.

Step 9:
If we divide 2010 by 669, we get 3 and a remainder of 3.
The next digit of our result is 3. 
Result so far: 46319.3
The remainder is 3 after subtracting 2007 from 2010.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Advancing to step 10:
669 goes into 30 0 times with a remainder of 30.
The next digit of our result is 0. 
Result so far: 46319.3
Subtracting 0 from 30 leaves us with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Step 11:
When dividing 300 by 669, we get 0 with a remainder of 300.
Record the quotient 0 as the next digit in the result. 
Result so far: 46319.3
The remainder is 300 after subtracting 0 from 300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3000, and continue the process.

In conclusion, the division gives 46319.3 with a balance of 0.03.