Let's divide 19453843 by 345
The aim is to understand the frequency of 345 in 19453843.

Advancing to step 1:
The number 345 fits into 1 0 times, leaving a remainder of 1.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 1 after subtracting 0 from 1.
Fetch the next digit (9) from the dividend, attach it to 1 and continue: 19 / 345

Advancing to step 2:
When dividing 19 by 345, we get 0 with a remainder of 19.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 19 after subtracting 0 from 19.
Fetch the next digit (4) from the dividend, attach it to 19 and continue: 194 / 345

Going ahead to step 3:
345 can be fit into 194 0 times, resulting in a remainder of 194.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 194 and we're left with 194.
Include the next digit (5) from the dividend after 194, then repeat: 1945 / 345

Advancing to step 4:
When dividing 1945 by 345, we get 5 with a remainder of 220.
Record the quotient 5 as the next digit in the result. 
Result so far: 5.0
Deduct 1725 from 1945 and we're left with 220.
Take the next digit (3) from the dividend and append it to 220, then repeat: 2203 / 345

Advancing to step 5:
When dividing 2203 by 345, we get 6 with a remainder of 133.
The next digit of our result is 6. 
Result so far: 56.0
The remainder is 133 after subtracting 2070 from 2203.
Bring next digit (8) of the dividend behind the 133 and repeat the process: 1338 / 345

Let's proceed to step 6:
If we divide 1338 by 345, we get 3 and a remainder of 303.
The next digit of our result is 3. 
Result so far: 563.0
Subtracting 1035 from 1338 leaves us with 303.
Bring next digit (4) of the dividend behind the 303 and repeat the process: 3034 / 345

Step 7:
345 goes into 3034 8 times with a remainder of 274.
Record the quotient 8 as the next digit in the result. 
Result so far: 5638.0
Deduct 2760 from 3034 and we're left with 274.
Bring next digit (3) of the dividend behind the 274 and repeat the process: 2743 / 345

Step 8:
If we divide 2743 by 345, we get 7 and a remainder of 328.
The number 7 becomes the next digit in our result. 
Result so far: 56387.0
If we subtract 2415 from 2743, we get 328.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3280, and continue the process.

Advancing to step 9:
345 can be fit into 3280 9 times, resulting in a remainder of 175.
Write down 9 as next digit of the result. 
Result so far: 56387.9
If we take 3105 away from 3280, we end up with 175.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1750, and continue the process.

Advancing to step 10:
If we divide 1750 by 345, we get 5 and a remainder of 25.
The number 5 becomes the next digit in our result. 
Result so far: 56387.95
If we take 1725 away from 1750, we end up with 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

Going ahead to step 11:
The number 345 fits into 250 0 times, leaving a remainder of 250.
Write down 0 as next digit of the result. 
Result so far: 56387.95
Subtract 0 from 250 to get 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 12:
If we divide 2500 by 345, we get 7 and a remainder of 85.
The number 7 becomes the next digit in our result. 
Result so far: 56387.9507
If we subtract 2415 from 2500, we get 85.
Since there are no more digits in the dividend, we add a zero to the remainder making it 850, and continue the process.

Let's proceed to step 13:
345 can be fit into 850 2 times, resulting in a remainder of 160.
The next digit of our result is 2. 
Result so far: 56387.95072
Subtract 690 from 850 to get 160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1600, and continue the process.

Step 14:
The number 345 fits into 1600 4 times, leaving a remainder of 220.
Put 4 as the next digit of the answer. 
Result so far: 56387.950724
Subtracting 1380 from 1600 leaves us with 220.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2200, and continue the process.

Step 15:
345 goes into 2200 6 times with a remainder of 130.
Record the quotient 6 as the next digit in the result. 
Result so far: 56387.9507246
Subtracting 2070 from 2200 leaves us with 130.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1300, and continue the process.

Advancing to step 16:
345 goes into 1300 3 times with a remainder of 265.
The next digit of our result is 3. 
Result so far: 56387.95072463
If we take 1035 away from 1300, we end up with 265.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2650, and continue the process.

The final result is 56387.95072463 with a remainder of 2.65e-07.