We look at the division of 74369643 by 669 
The aim is to understand the frequency of 669 in 74369643.

On to step 1:
When dividing 7 by 669, we get 0 with a remainder of 7.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 7, we get 7.
Bring next digit (4) of the dividend behind the 7 and repeat the process: 74 / 669

Step 2:
74 divided by 669 is 0 with a remainder of 74.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 74 and we're left with 74.
Bring next digit (3) of the dividend behind the 74 and repeat the process: 743 / 669

Advancing to step 3:
The number 669 fits into 743 1 times, leaving a remainder of 74.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
If we take 669 away from 743, we end up with 74.
Append the next digit (6) from the dividend to 74 and continue with: 746 / 669

Advancing to step 4:
If we divide 746 by 669, we get 1 and a remainder of 77.
Write down 1 as next digit of the result. 
Result so far: 11.0
The remainder is 77 after subtracting 669 from 746.
Append the next digit (9) from the dividend to 77 and continue with: 779 / 669

Going ahead to step 5:
669 goes into 779 1 times with a remainder of 110.
Record the quotient 1 as the next digit in the result. 
Result so far: 111.0
The remainder is 110 after subtracting 669 from 779.
Fetch the next digit (6) from the dividend, attach it to 110 and continue: 1106 / 669

Moving on to step 6:
669 can be fit into 1106 1 times, resulting in a remainder of 437.
The number 1 becomes the next digit in our result. 
Result so far: 1111.0
Subtract 669 from 1106 to get 437.
Append the next digit (4) from the dividend to 437 and continue with: 4374 / 669

Step 7:
If we divide 4374 by 669, we get 6 and a remainder of 360.
Put 6 as the next digit of the answer. 
Result so far: 11116.0
If we take 4014 away from 4374, we end up with 360.
Take the next digit (3) from the dividend and append it to 360, then repeat: 3603 / 669

On to step 8:
669 can be fit into 3603 5 times, resulting in a remainder of 258.
Use 5 as the next digit of our solution. 
Result so far: 111165.0
Deduct 3345 from 3603 and we're left with 258.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2580, and continue the process.

Moving on to step 9:
2580 divided by 669 is 3 with a remainder of 573.
Use 3 as the next digit of our solution. 
Result so far: 111165.3
The remainder is 573 after subtracting 2007 from 2580.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5730, and continue the process.

Advancing to step 10:
The number 669 fits into 5730 8 times, leaving a remainder of 378.
Use 8 as the next digit of our solution. 
Result so far: 111165.38
Subtract 5352 from 5730 to get 378.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3780, and continue the process.

Moving on to step 11:
The number 669 fits into 3780 5 times, leaving a remainder of 435.
Use 5 as the next digit of our solution. 
Result so far: 111165.385
Subtract 3345 from 3780 to get 435.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4350, and continue the process.

Going ahead to step 12:
669 can be fit into 4350 6 times, resulting in a remainder of 336.
Put 6 as the next digit of the answer. 
Result so far: 111165.3856
Subtract 4014 from 4350 to get 336.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3360, and continue the process.

Going ahead to step 13:
3360 divided by 669 is 5 with a remainder of 15.
The next digit of our result is 5. 
Result so far: 111165.38565
If we take 3345 away from 3360, we end up with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Advancing to step 14:
669 can be fit into 150 0 times, resulting in a remainder of 150.
Use 0 as the next digit of our solution. 
Result so far: 111165.38565
Deduct 0 from 150 and we're left with 150.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1500, and continue the process.

Advancing to step 15:
If we divide 1500 by 669, we get 2 and a remainder of 162.
Write down 2 as next digit of the result. 
Result so far: 111165.3856502
Subtract 1338 from 1500 to get 162.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1620, and continue the process.

Moving on to step 16:
If we divide 1620 by 669, we get 2 and a remainder of 282.
Use 2 as the next digit of our solution. 
Result so far: 111165.38565022
The remainder is 282 after subtracting 1338 from 1620.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2820, and continue the process.

After the division, we end up with 111165.38565022 and a remainder of 2.82e-07.