28379023 ÷ 669 
The aim is to understand the frequency of 669 in 28379023.

On to step 1:
2 divided by 669 is 0 with a remainder of 2.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 2 to get 2.
Fetch the next digit (8) from the dividend, attach it to 2 and continue: 28 / 669

On to step 2:
669 can be fit into 28 0 times, resulting in a remainder of 28.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 28 and we're left with 28.
Bring next digit (3) of the dividend behind the 28 and repeat the process: 283 / 669

Going ahead to step 3:
283 divided by 669 is 0 with a remainder of 283.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 283 and we're left with 283.
Take the next digit (7) from the dividend and append it to 283, then repeat: 2837 / 669

On to step 4:
2837 divided by 669 is 4 with a remainder of 161.
Put 4 as the next digit of the answer. 
Result so far: 4.0
The remainder is 161 after subtracting 2676 from 2837.
Append the next digit (9) from the dividend to 161 and continue with: 1619 / 669

Moving on to step 5:
When dividing 1619 by 669, we get 2 with a remainder of 281.
The next digit of our result is 2. 
Result so far: 42.0
The remainder is 281 after subtracting 1338 from 1619.
Grab the next digit (0) from the dividend, add it to 281, then carry on: 2810 / 669

Going ahead to step 6:
2810 divided by 669 is 4 with a remainder of 134.
Use 4 as the next digit of our solution. 
Result so far: 424.0
Deduct 2676 from 2810 and we're left with 134.
Fetch the next digit (2) from the dividend, attach it to 134 and continue: 1342 / 669

Advancing to step 7:
669 goes into 1342 2 times with a remainder of 4.
Record the quotient 2 as the next digit in the result. 
Result so far: 4242.0
Subtracting 1338 from 1342 leaves us with 4.
Take the next digit (3) from the dividend and append it to 4, then repeat: 43 / 669

Advancing to step 8:
669 goes into 43 0 times with a remainder of 43.
The number 0 becomes the next digit in our result. 
Result so far: 42420.0
If we take 0 away from 43, we end up with 43.
Since there are no more digits in the dividend, we add a zero to the remainder making it 430, and continue the process.

Step 9:
When dividing 430 by 669, we get 0 with a remainder of 430.
The number 0 becomes the next digit in our result. 
Result so far: 42420.0
If we take 0 away from 430, we end up with 430.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4300, and continue the process.

Let's proceed to step 10:
If we divide 4300 by 669, we get 6 and a remainder of 286.
Put 6 as the next digit of the answer. 
Result so far: 42420.06
Subtract 4014 from 4300 to get 286.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2860, and continue the process.

Going ahead to step 11:
669 can be fit into 2860 4 times, resulting in a remainder of 184.
Record the quotient 4 as the next digit in the result. 
Result so far: 42420.064
Deduct 2676 from 2860 and we're left with 184.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1840, and continue the process.

Let's proceed to step 12:
When dividing 1840 by 669, we get 2 with a remainder of 502.
Record the quotient 2 as the next digit in the result. 
Result so far: 42420.0642
If we subtract 1338 from 1840, we get 502.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5020, and continue the process.

Advancing to step 13:
When dividing 5020 by 669, we get 7 with a remainder of 337.
Use 7 as the next digit of our solution. 
Result so far: 42420.06427
Subtracting 4683 from 5020 leaves us with 337.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3370, and continue the process.

On to step 14:
When dividing 3370 by 669, we get 5 with a remainder of 25.
The next digit of our result is 5. 
Result so far: 42420.064275
Subtract 3345 from 3370 to get 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

Step 15:
250 divided by 669 is 0 with a remainder of 250.
Record the quotient 0 as the next digit in the result. 
Result so far: 42420.064275
The remainder is 250 after subtracting 0 from 250.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2500, and continue the process.

Moving on to step 16:
When dividing 2500 by 669, we get 3 with a remainder of 493.
The number 3 becomes the next digit in our result. 
Result so far: 42420.06427503
Subtract 2007 from 2500 to get 493.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4930, and continue the process.

The final outcome is 42420.06427503, with a leftover of 4.93e-07.