43712921 ÷ 144 
The aim is to understand the frequency of 144 in 43712921.

Going ahead to step 1:
144 can be fit into 4 0 times, resulting in a remainder of 4.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 4, we get 4.
Include the next digit (3) from the dividend after 4, then repeat: 43 / 144

Advancing to step 2:
The number 144 fits into 43 0 times, leaving a remainder of 43.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 43 leaves us with 43.
Fetch the next digit (7) from the dividend, attach it to 43 and continue: 437 / 144

Moving on to step 3:
If we divide 437 by 144, we get 3 and a remainder of 5.
The next digit of our result is 3. 
Result so far: 3.0
If we take 432 away from 437, we end up with 5.
Bring next digit (1) of the dividend behind the 5 and repeat the process: 51 / 144

Going ahead to step 4:
144 can be fit into 51 0 times, resulting in a remainder of 51.
The number 0 becomes the next digit in our result. 
Result so far: 30.0
If we take 0 away from 51, we end up with 51.
Bring next digit (2) of the dividend behind the 51 and repeat the process: 512 / 144

Going ahead to step 5:
144 goes into 512 3 times with a remainder of 80.
The next digit of our result is 3. 
Result so far: 303.0
If we subtract 432 from 512, we get 80.
Append the next digit (9) from the dividend to 80 and continue with: 809 / 144

Advancing to step 6:
When dividing 809 by 144, we get 5 with a remainder of 89.
Use 5 as the next digit of our solution. 
Result so far: 3035.0
If we subtract 720 from 809, we get 89.
Grab the next digit (2) from the dividend, add it to 89, then carry on: 892 / 144

Let's proceed to step 7:
892 divided by 144 is 6 with a remainder of 28.
Write down 6 as next digit of the result. 
Result so far: 30356.0
The remainder is 28 after subtracting 864 from 892.
Bring next digit (1) of the dividend behind the 28 and repeat the process: 281 / 144

Step 8:
144 can be fit into 281 1 times, resulting in a remainder of 137.
Write down 1 as next digit of the result. 
Result so far: 303561.0
If we take 144 away from 281, we end up with 137.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1370, and continue the process.

Going ahead to step 9:
1370 divided by 144 is 9 with a remainder of 74.
Use 9 as the next digit of our solution. 
Result so far: 303561.9
If we subtract 1296 from 1370, we get 74.
Since there are no more digits in the dividend, we add a zero to the remainder making it 740, and continue the process.

Advancing to step 10:
740 divided by 144 is 5 with a remainder of 20.
The next digit of our result is 5. 
Result so far: 303561.95
Subtracting 720 from 740 leaves us with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Advancing to step 11:
When dividing 200 by 144, we get 1 with a remainder of 56.
Use 1 as the next digit of our solution. 
Result so far: 303561.951
The remainder is 56 after subtracting 144 from 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 560, and continue the process.

Step 12:
560 divided by 144 is 3 with a remainder of 128.
Write down 3 as next digit of the result. 
Result so far: 303561.9513
Subtract 432 from 560 to get 128.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1280, and continue the process.

Let's proceed to step 13:
The number 144 fits into 1280 8 times, leaving a remainder of 128.
The number 8 becomes the next digit in our result. 
Result so far: 303561.95138
The remainder is 128 after subtracting 1152 from 1280.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1280, and continue the process.

On to step 14:
144 goes into 1280 8 times with a remainder of 128.
The number 8 becomes the next digit in our result. 
Result so far: 303561.951388
The remainder is 128 after subtracting 1152 from 1280.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1280, and continue the process.

The final result is 303561.951388 with a remainder of 1.28e-05.