Let's divide 15809525 by 40
The aim is to understand the frequency of 40 in 15809525.

Let's proceed to step 1:
When dividing 1 by 40, we get 0 with a remainder of 1.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 1 after subtracting 0 from 1.
Append the next digit (5) from the dividend to 1 and continue with: 15 / 40

Let's proceed to step 2:
15 divided by 40 is 0 with a remainder of 15.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 15 leaves us with 15.
Append the next digit (8) from the dividend to 15 and continue with: 158 / 40

Step 3:
The number 40 fits into 158 3 times, leaving a remainder of 38.
Put 3 as the next digit of the answer. 
Result so far: 3.0
The remainder is 38 after subtracting 120 from 158.
Take the next digit (0) from the dividend and append it to 38, then repeat: 380 / 40

Going ahead to step 4:
40 goes into 380 9 times with a remainder of 20.
Record the quotient 9 as the next digit in the result. 
Result so far: 39.0
If we subtract 360 from 380, we get 20.
Bring next digit (9) of the dividend behind the 20 and repeat the process: 209 / 40

Let's proceed to step 5:
40 can be fit into 209 5 times, resulting in a remainder of 9.
Put 5 as the next digit of the answer. 
Result so far: 395.0
If we subtract 200 from 209, we get 9.
Include the next digit (5) from the dividend after 9, then repeat: 95 / 40

Moving on to step 6:
40 goes into 95 2 times with a remainder of 15.
Put 2 as the next digit of the answer. 
Result so far: 3952.0
If we subtract 80 from 95, we get 15.
Fetch the next digit (2) from the dividend, attach it to 15 and continue: 152 / 40

Moving on to step 7:
When dividing 152 by 40, we get 3 with a remainder of 32.
The next digit of our result is 3. 
Result so far: 39523.0
Deduct 120 from 152 and we're left with 32.
Fetch the next digit (5) from the dividend, attach it to 32 and continue: 325 / 40

Step 8:
The number 40 fits into 325 8 times, leaving a remainder of 5.
The number 8 becomes the next digit in our result. 
Result so far: 395238.0
Deduct 320 from 325 and we're left with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Step 9:
When dividing 50 by 40, we get 1 with a remainder of 10.
Record the quotient 1 as the next digit in the result. 
Result so far: 395238.1
The remainder is 10 after subtracting 40 from 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Going ahead to step 10:
When dividing 100 by 40, we get 2 with a remainder of 20.
Put 2 as the next digit of the answer. 
Result so far: 395238.12
Subtracting 80 from 100 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.

Going ahead to step 11:
40 goes into 200 5 times with a remainder of 0.
Put 5 as the next digit of the answer. 
Result so far: 395238.125
Deduct 200 from 200 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.

Step 12:
If we divide 0 by 40, we get 0 and a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 395238.125
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.

Going ahead to step 13:
The number 40 fits into 0 0 times, leaving a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 395238.125
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.

The final result is 395238.125 with a remainder of 0.0.