451990 ÷ 16 
The aim is to understand the frequency of 16 in 451990.

Advancing to step 1:
If we divide 4 by 16, we get 0 and a remainder of 4.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 4, we get 4.
Bring next digit (5) of the dividend behind the 4 and repeat the process: 45 / 16

Advancing to step 2:
16 can be fit into 45 2 times, resulting in a remainder of 13.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
If we subtract 32 from 45, we get 13.
Take the next digit (1) from the dividend and append it to 13, then repeat: 131 / 16

On to step 3:
16 goes into 131 8 times with a remainder of 3.
Record the quotient 8 as the next digit in the result. 
Result so far: 28.0
The remainder is 3 after subtracting 128 from 131.
Take the next digit (9) from the dividend and append it to 3, then repeat: 39 / 16

Advancing to step 4:
When dividing 39 by 16, we get 2 with a remainder of 7.
Record the quotient 2 as the next digit in the result. 
Result so far: 282.0
Subtracting 32 from 39 leaves us with 7.
Grab the next digit (9) from the dividend, add it to 7, then carry on: 79 / 16

Step 5:
16 can be fit into 79 4 times, resulting in a remainder of 15.
The next digit of our result is 4. 
Result so far: 2824.0
Deduct 64 from 79 and we're left with 15.
Grab the next digit (0) from the dividend, add it to 15, then carry on: 150 / 16

On to step 6:
16 can be fit into 150 9 times, resulting in a remainder of 6.
Put 9 as the next digit of the answer. 
Result so far: 28249.0
The remainder is 6 after subtracting 144 from 150.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

On to step 7:
The number 16 fits into 60 3 times, leaving a remainder of 12.
Use 3 as the next digit of our solution. 
Result so far: 28249.3
If we take 48 away from 60, we end up with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Moving on to step 8:
If we divide 120 by 16, we get 7 and a remainder of 8.
Write down 7 as next digit of the result. 
Result so far: 28249.37
Subtract 112 from 120 to get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Step 9:
When dividing 80 by 16, we get 5 with a remainder of 0.
Put 5 as the next digit of the answer. 
Result so far: 28249.375
If we subtract 80 from 80, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Going ahead to step 10:
When dividing 0 by 16, we get 0 with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 28249.375
Deduct 0 from 0 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Going ahead to step 11:
16 goes into 0 0 times with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 28249.375
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Our division results in 28249.375 with a remaining 0.0.