19815101 ÷ 449 
The aim is to understand the frequency of 449 in 19815101.

On to step 1:
If we divide 1 by 449, we get 0 and a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 1 leaves us with 1.
Grab the next digit (9) from the dividend, add it to 1, then carry on: 19 / 449

Step 2:
449 can be fit into 19 0 times, resulting in a remainder of 19.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 19 and we're left with 19.
Include the next digit (8) from the dividend after 19, then repeat: 198 / 449

Going ahead to step 3:
When dividing 198 by 449, we get 0 with a remainder of 198.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 198 and we're left with 198.
Fetch the next digit (1) from the dividend, attach it to 198 and continue: 1981 / 449

Going ahead to step 4:
449 can be fit into 1981 4 times, resulting in a remainder of 185.
Use 4 as the next digit of our solution. 
Result so far: 4.0
The remainder is 185 after subtracting 1796 from 1981.
Append the next digit (5) from the dividend to 185 and continue with: 1855 / 449

Going ahead to step 5:
When dividing 1855 by 449, we get 4 with a remainder of 59.
Use 4 as the next digit of our solution. 
Result so far: 44.0
The remainder is 59 after subtracting 1796 from 1855.
Grab the next digit (1) from the dividend, add it to 59, then carry on: 591 / 449

Let's proceed to step 6:
If we divide 591 by 449, we get 1 and a remainder of 142.
Write down 1 as next digit of the result. 
Result so far: 441.0
The remainder is 142 after subtracting 449 from 591.
Bring next digit (0) of the dividend behind the 142 and repeat the process: 1420 / 449

Moving on to step 7:
449 goes into 1420 3 times with a remainder of 73.
Put 3 as the next digit of the answer. 
Result so far: 4413.0
Deduct 1347 from 1420 and we're left with 73.
Fetch the next digit (1) from the dividend, attach it to 73 and continue: 731 / 449

Moving on to step 8:
The number 449 fits into 731 1 times, leaving a remainder of 282.
Put 1 as the next digit of the answer. 
Result so far: 44131.0
Subtracting 449 from 731 leaves us with 282.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2820, and continue the process.

Advancing to step 9:
When dividing 2820 by 449, we get 6 with a remainder of 126.
The next digit of our result is 6. 
Result so far: 44131.6
Subtract 2694 from 2820 to get 126.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1260, and continue the process.

Going ahead to step 10:
If we divide 1260 by 449, we get 2 and a remainder of 362.
Use 2 as the next digit of our solution. 
Result so far: 44131.62
If we subtract 898 from 1260, we get 362.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3620, and continue the process.

Advancing to step 11:
449 can be fit into 3620 8 times, resulting in a remainder of 28.
Record the quotient 8 as the next digit in the result. 
Result so far: 44131.628
If we take 3592 away from 3620, we end up with 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Advancing to step 12:
When dividing 280 by 449, we get 0 with a remainder of 280.
The number 0 becomes the next digit in our result. 
Result so far: 44131.628
If we subtract 0 from 280, we get 280.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2800, and continue the process.

On to step 13:
If we divide 2800 by 449, we get 6 and a remainder of 106.
The number 6 becomes the next digit in our result. 
Result so far: 44131.62806
Deduct 2694 from 2800 and we're left with 106.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1060, and continue the process.

On to step 14:
449 goes into 1060 2 times with a remainder of 162.
Put 2 as the next digit of the answer. 
Result so far: 44131.628062
Subtracting 898 from 1060 leaves us with 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 15:
449 goes into 1620 3 times with a remainder of 273.
Use 3 as the next digit of our solution. 
Result so far: 44131.6280623
Subtract 1347 from 1620 to get 273.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2730, and continue the process.

Let's proceed to step 16:
The number 449 fits into 2730 6 times, leaving a remainder of 36.
Put 6 as the next digit of the answer. 
Result so far: 44131.62806236
Deduct 2694 from 2730 and we're left with 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Our division results in 44131.62806236 with a remaining 3.6e-08.