We're dividing 15846 by 40 
The aim is to understand the frequency of 40 in 15846.

Advancing to step 1:
The number 40 fits into 1 0 times, leaving a remainder of 1.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 1 after subtracting 0 from 1.
Grab the next digit (5) from the dividend, add it to 1, then carry on: 15 / 40

Step 2:
40 can be fit into 15 0 times, resulting in a remainder of 15.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 15 and we're left with 15.
Include the next digit (8) from the dividend after 15, then repeat: 158 / 40

Going ahead to step 3:
The number 40 fits into 158 3 times, leaving a remainder of 38.
The next digit of our result is 3. 
Result so far: 3.0
Subtracting 120 from 158 leaves us with 38.
Include the next digit (4) from the dividend after 38, then repeat: 384 / 40

Going ahead to step 4:
384 divided by 40 is 9 with a remainder of 24.
Use 9 as the next digit of our solution. 
Result so far: 39.0
The remainder is 24 after subtracting 360 from 384.
Bring next digit (6) of the dividend behind the 24 and repeat the process: 246 / 40

Moving on to step 5:
246 divided by 40 is 6 with a remainder of 6.
The next digit of our result is 6. 
Result so far: 396.0
Subtract 240 from 246 to get 6.
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 6:
40 can be fit into 60 1 times, resulting in a remainder of 20.
Record the quotient 1 as the next digit in the result. 
Result so far: 396.1
Deduct 40 from 60 and we're left 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 7:
When dividing 200 by 40, we get 5 with a remainder of 0.
The next digit of our result is 5. 
Result so far: 396.15
If we subtract 200 from 200, 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 8:
The number 40 fits into 0 0 times, leaving a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 396.15
If we subtract 0 from 0, 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.

Step 9:
40 goes into 0 0 times with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 396.15
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 quotient of the division is 396.15, and the remainder is 0.0.