We divide 12990721 by 16
The aim is to understand the frequency of 16 in 12990721.

Going ahead to step 1:
The number 16 fits into 1 0 times, leaving a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 1, we end up with 1.
Fetch the next digit (2) from the dividend, attach it to 1 and continue: 12 / 16

Advancing to step 2:
The number 16 fits into 12 0 times, leaving a remainder of 12.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 12 to get 12.
Grab the next digit (9) from the dividend, add it to 12, then carry on: 129 / 16

Going ahead to step 3:
When dividing 129 by 16, we get 8 with a remainder of 1.
The number 8 becomes the next digit in our result. 
Result so far: 8.0
Subtracting 128 from 129 leaves us with 1.
Append the next digit (9) from the dividend to 1 and continue with: 19 / 16

Advancing to step 4:
The number 16 fits into 19 1 times, leaving a remainder of 3.
Record the quotient 1 as the next digit in the result. 
Result so far: 81.0
Deduct 16 from 19 and we're left with 3.
Bring next digit (0) of the dividend behind the 3 and repeat the process: 30 / 16

Advancing to step 5:
When dividing 30 by 16, we get 1 with a remainder of 14.
Write down 1 as next digit of the result. 
Result so far: 811.0
Deduct 16 from 30 and we're left with 14.
Fetch the next digit (7) from the dividend, attach it to 14 and continue: 147 / 16

On to step 6:
When dividing 147 by 16, we get 9 with a remainder of 3.
The number 9 becomes the next digit in our result. 
Result so far: 8119.0
Deduct 144 from 147 and we're left with 3.
Grab the next digit (2) from the dividend, add it to 3, then carry on: 32 / 16

Advancing to step 7:
When dividing 32 by 16, we get 2 with a remainder of 0.
Use 2 as the next digit of our solution. 
Result so far: 81192.0
Deduct 32 from 32 and we're left with 0.
Fetch the next digit (1) from the dividend, attach it to 0 and continue: 1 / 16

Step 8:
1 divided by 16 is 0 with a remainder of 1.
Put 0 as the next digit of the answer. 
Result so far: 811920.0
Subtracting 0 from 1 leaves us with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

On to step 9:
16 can be fit into 10 0 times, resulting in a remainder of 10.
The number 0 becomes the next digit in our result. 
Result so far: 811920.0
If we take 0 away from 10, we end up with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

On to step 10:
The number 16 fits into 100 6 times, leaving a remainder of 4.
The number 6 becomes the next digit in our result. 
Result so far: 811920.06
Subtract 96 from 100 to get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

On to step 11:
40 divided by 16 is 2 with a remainder of 8.
Use 2 as the next digit of our solution. 
Result so far: 811920.062
Subtract 32 from 40 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.

On to step 12:
16 goes into 80 5 times with a remainder of 0.
Put 5 as the next digit of the answer. 
Result so far: 811920.0625
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.

On to step 13:
If we divide 0 by 16, we get 0 and a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 811920.0625
Subtracting 0 from 0 leaves us 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.

Step 14:
0 divided by 16 is 0 with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 811920.0625
If we take 0 away from 0, we end up 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.

After the division, we end up with 811920.0625 and a remainder of 0.0.