We look at the division of 16251248 by 345 
The aim is to understand the frequency of 345 in 16251248.

Advancing to step 1:
345 goes into 1 0 times with a remainder of 1.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 1, we end up with 1.
Include the next digit (6) from the dividend after 1, then repeat: 16 / 345

Step 2:
The number 345 fits into 16 0 times, leaving a remainder of 16.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 16 to get 16.
Include the next digit (2) from the dividend after 16, then repeat: 162 / 345

Going ahead to step 3:
When dividing 162 by 345, we get 0 with a remainder of 162.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 162, we end up with 162.
Grab the next digit (5) from the dividend, add it to 162, then carry on: 1625 / 345

Step 4:
345 goes into 1625 4 times with a remainder of 245.
The next digit of our result is 4. 
Result so far: 4.0
If we take 1380 away from 1625, we end up with 245.
Append the next digit (1) from the dividend to 245 and continue with: 2451 / 345

Let's proceed to step 5:
2451 divided by 345 is 7 with a remainder of 36.
Write down 7 as next digit of the result. 
Result so far: 47.0
If we subtract 2415 from 2451, we get 36.
Fetch the next digit (2) from the dividend, attach it to 36 and continue: 362 / 345

Going ahead to step 6:
When dividing 362 by 345, we get 1 with a remainder of 17.
The number 1 becomes the next digit in our result. 
Result so far: 471.0
Subtract 345 from 362 to get 17.
Grab the next digit (4) from the dividend, add it to 17, then carry on: 174 / 345

Advancing to step 7:
When dividing 174 by 345, we get 0 with a remainder of 174.
Put 0 as the next digit of the answer. 
Result so far: 4710.0
Subtract 0 from 174 to get 174.
Bring next digit (8) of the dividend behind the 174 and repeat the process: 1748 / 345

Going ahead to step 8:
1748 divided by 345 is 5 with a remainder of 23.
Write down 5 as next digit of the result. 
Result so far: 47105.0
Subtracting 1725 from 1748 leaves us with 23.
Since there are no more digits in the dividend, we add a zero to the remainder making it 230, and continue the process.

Step 9:
345 goes into 230 0 times with a remainder of 230.
The next digit of our result is 0. 
Result so far: 47105.0
If we subtract 0 from 230, we get 230.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2300, and continue the process.

Moving on to step 10:
If we divide 2300 by 345, we get 6 and a remainder of 230.
Put 6 as the next digit of the answer. 
Result so far: 47105.06
If we take 2070 away from 2300, we end up with 230.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2300, and continue the process.

Moving on to step 11:
345 can be fit into 2300 6 times, resulting in a remainder of 230.
The next digit of our result is 6. 
Result so far: 47105.066
Deduct 2070 from 2300 and we're left with 230.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2300, and continue the process.

The final outcome is 47105.066, with a leftover of 0.023.