We're dividing 83328664 by 661 
The aim is to understand the frequency of 661 in 83328664.

Step 1:
661 can be fit into 8 0 times, resulting in a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Include the next digit (3) from the dividend after 8, then repeat: 83 / 661

On to step 2:
83 divided by 661 is 0 with a remainder of 83.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 83, we end up with 83.
Grab the next digit (3) from the dividend, add it to 83, then carry on: 833 / 661

Step 3:
When dividing 833 by 661, we get 1 with a remainder of 172.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Deduct 661 from 833 and we're left with 172.
Append the next digit (2) from the dividend to 172 and continue with: 1722 / 661

Let's proceed to step 4:
When dividing 1722 by 661, we get 2 with a remainder of 400.
Use 2 as the next digit of our solution. 
Result so far: 12.0
Deduct 1322 from 1722 and we're left with 400.
Grab the next digit (8) from the dividend, add it to 400, then carry on: 4008 / 661

Going ahead to step 5:
The number 661 fits into 4008 6 times, leaving a remainder of 42.
Record the quotient 6 as the next digit in the result. 
Result so far: 126.0
If we take 3966 away from 4008, we end up with 42.
Take the next digit (6) from the dividend and append it to 42, then repeat: 426 / 661

Advancing to step 6:
If we divide 426 by 661, we get 0 and a remainder of 426.
Use 0 as the next digit of our solution. 
Result so far: 1260.0
If we take 0 away from 426, we end up with 426.
Include the next digit (6) from the dividend after 426, then repeat: 4266 / 661

Advancing to step 7:
When dividing 4266 by 661, we get 6 with a remainder of 300.
The next digit of our result is 6. 
Result so far: 12606.0
The remainder is 300 after subtracting 3966 from 4266.
Take the next digit (4) from the dividend and append it to 300, then repeat: 3004 / 661

Advancing to step 8:
When dividing 3004 by 661, we get 4 with a remainder of 360.
The next digit of our result is 4. 
Result so far: 126064.0
If we subtract 2644 from 3004, we get 360.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3600, and continue the process.

Moving on to step 9:
3600 divided by 661 is 5 with a remainder of 295.
The number 5 becomes the next digit in our result. 
Result so far: 126064.5
Deduct 3305 from 3600 and we're left with 295.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2950, and continue the process.

On to step 10:
2950 divided by 661 is 4 with a remainder of 306.
The next digit of our result is 4. 
Result so far: 126064.54
If we subtract 2644 from 2950, we get 306.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3060, and continue the process.

Step 11:
661 goes into 3060 4 times with a remainder of 416.
Record the quotient 4 as the next digit in the result. 
Result so far: 126064.544
The remainder is 416 after subtracting 2644 from 3060.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4160, and continue the process.

The final outcome is 126064.544, with a leftover of 0.0416.