We look at the division of 61015838 by 669 
The aim is to understand the frequency of 669 in 61015838.

Step 1:
If we divide 6 by 669, we get 0 and a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 6 after subtracting 0 from 6.
Fetch the next digit (1) from the dividend, attach it to 6 and continue: 61 / 669

Let's proceed to step 2:
When dividing 61 by 669, we get 0 with a remainder of 61.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 61, we end up with 61.
Append the next digit (0) from the dividend to 61 and continue with: 610 / 669

Let's proceed to step 3:
The number 669 fits into 610 0 times, leaving a remainder of 610.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 610 after subtracting 0 from 610.
Include the next digit (1) from the dividend after 610, then repeat: 6101 / 669

Moving on to step 4:
If we divide 6101 by 669, we get 9 and a remainder of 80.
Use 9 as the next digit of our solution. 
Result so far: 9.0
The remainder is 80 after subtracting 6021 from 6101.
Take the next digit (5) from the dividend and append it to 80, then repeat: 805 / 669

Moving on to step 5:
805 divided by 669 is 1 with a remainder of 136.
Write down 1 as next digit of the result. 
Result so far: 91.0
If we subtract 669 from 805, we get 136.
Bring next digit (8) of the dividend behind the 136 and repeat the process: 1368 / 669

On to step 6:
If we divide 1368 by 669, we get 2 and a remainder of 30.
Write down 2 as next digit of the result. 
Result so far: 912.0
The remainder is 30 after subtracting 1338 from 1368.
Take the next digit (3) from the dividend and append it to 30, then repeat: 303 / 669

Advancing to step 7:
303 divided by 669 is 0 with a remainder of 303.
Record the quotient 0 as the next digit in the result. 
Result so far: 9120.0
The remainder is 303 after subtracting 0 from 303.
Append the next digit (8) from the dividend to 303 and continue with: 3038 / 669

Let's proceed to step 8:
669 can be fit into 3038 4 times, resulting in a remainder of 362.
Put 4 as the next digit of the answer. 
Result so far: 91204.0
Subtracting 2676 from 3038 leaves us with 362.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3620, and continue the process.

Going ahead to step 9:
The number 669 fits into 3620 5 times, leaving a remainder of 275.
The next digit of our result is 5. 
Result so far: 91204.5
Subtract 3345 from 3620 to get 275.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2750, and continue the process.

Moving on to step 10:
669 goes into 2750 4 times with a remainder of 74.
The next digit of our result is 4. 
Result so far: 91204.54
Subtracting 2676 from 2750 leaves us with 74.
Since there are no more digits in the dividend, we add a zero to the remainder making it 740, and continue the process.

Moving on to step 11:
669 goes into 740 1 times with a remainder of 71.
Write down 1 as next digit of the result. 
Result so far: 91204.541
If we take 669 away from 740, we end up with 71.
Since there are no more digits in the dividend, we add a zero to the remainder making it 710, and continue the process.

On to step 12:
669 goes into 710 1 times with a remainder of 41.
The number 1 becomes the next digit in our result. 
Result so far: 91204.5411
If we subtract 669 from 710, we get 41.
Since there are no more digits in the dividend, we add a zero to the remainder making it 410, and continue the process.

After the division, we end up with 91204.5411 and a remainder of 0.00041.