16002421 ÷ 349 
The aim is to understand the frequency of 349 in 16002421.

Going ahead to step 1:
The number 349 fits into 1 0 times, leaving a remainder of 1.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Append the next digit (6) from the dividend to 1 and continue with: 16 / 349

Moving on to step 2:
16 divided by 349 is 0 with a remainder of 16.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 16 and we're left with 16.
Bring next digit (0) of the dividend behind the 16 and repeat the process: 160 / 349

Step 3:
160 divided by 349 is 0 with a remainder of 160.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 160, we end up with 160.
Include the next digit (0) from the dividend after 160, then repeat: 1600 / 349

Going ahead to step 4:
When dividing 1600 by 349, we get 4 with a remainder of 204.
Write down 4 as next digit of the result. 
Result so far: 4.0
If we take 1396 away from 1600, we end up with 204.
Take the next digit (2) from the dividend and append it to 204, then repeat: 2042 / 349

Let's proceed to step 5:
When dividing 2042 by 349, we get 5 with a remainder of 297.
Record the quotient 5 as the next digit in the result. 
Result so far: 45.0
If we take 1745 away from 2042, we end up with 297.
Bring next digit (4) of the dividend behind the 297 and repeat the process: 2974 / 349

Moving on to step 6:
349 can be fit into 2974 8 times, resulting in a remainder of 182.
The number 8 becomes the next digit in our result. 
Result so far: 458.0
Subtracting 2792 from 2974 leaves us with 182.
Grab the next digit (2) from the dividend, add it to 182, then carry on: 1822 / 349

Going ahead to step 7:
1822 divided by 349 is 5 with a remainder of 77.
The number 5 becomes the next digit in our result. 
Result so far: 4585.0
Deduct 1745 from 1822 and we're left with 77.
Grab the next digit (1) from the dividend, add it to 77, then carry on: 771 / 349

On to step 8:
If we divide 771 by 349, we get 2 and a remainder of 73.
The next digit of our result is 2. 
Result so far: 45852.0
If we take 698 away from 771, we end up with 73.
Since there are no more digits in the dividend, we add a zero to the remainder making it 730, and continue the process.

Let's proceed to step 9:
The number 349 fits into 730 2 times, leaving a remainder of 32.
The next digit of our result is 2. 
Result so far: 45852.2
Subtract 698 from 730 to get 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Moving on to step 10:
The number 349 fits into 320 0 times, leaving a remainder of 320.
The number 0 becomes the next digit in our result. 
Result so far: 45852.2
Subtract 0 from 320 to get 320.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3200, and continue the process.

On to step 11:
When dividing 3200 by 349, we get 9 with a remainder of 59.
The number 9 becomes the next digit in our result. 
Result so far: 45852.209
Subtracting 3141 from 3200 leaves us with 59.
Since there are no more digits in the dividend, we add a zero to the remainder making it 590, and continue the process.

Moving on to step 12:
349 can be fit into 590 1 times, resulting in a remainder of 241.
Use 1 as the next digit of our solution. 
Result so far: 45852.2091
Subtract 349 from 590 to get 241.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2410, and continue the process.

Step 13:
349 goes into 2410 6 times with a remainder of 316.
Write down 6 as next digit of the result. 
Result so far: 45852.20916
Subtracting 2094 from 2410 leaves us with 316.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3160, and continue the process.

Step 14:
349 can be fit into 3160 9 times, resulting in a remainder of 19.
Put 9 as the next digit of the answer. 
Result so far: 45852.209169
The remainder is 19 after subtracting 3141 from 3160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Let's proceed to step 15:
349 goes into 190 0 times with a remainder of 190.
Record the quotient 0 as the next digit in the result. 
Result so far: 45852.209169
Deduct 0 from 190 and we're left with 190.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1900, and continue the process.

Going ahead to step 16:
349 can be fit into 1900 5 times, resulting in a remainder of 155.
Put 5 as the next digit of the answer. 
Result so far: 45852.20916905
The remainder is 155 after subtracting 1745 from 1900.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1550, and continue the process.

The final outcome is 45852.20916905, with a leftover of 1.55e-07.