666446 ÷ 40 
The aim is to understand the frequency of 40 in 666446.

Step 1:
40 goes into 6 0 times with a remainder of 6.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Fetch the next digit (6) from the dividend, attach it to 6 and continue: 66 / 40

Step 2:
The number 40 fits into 66 1 times, leaving a remainder of 26.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
If we take 40 away from 66, we end up with 26.
Bring next digit (6) of the dividend behind the 26 and repeat the process: 266 / 40

Step 3:
40 can be fit into 266 6 times, resulting in a remainder of 26.
The number 6 becomes the next digit in our result. 
Result so far: 16.0
Deduct 240 from 266 and we're left with 26.
Take the next digit (4) from the dividend and append it to 26, then repeat: 264 / 40

Moving on to step 4:
The number 40 fits into 264 6 times, leaving a remainder of 24.
Record the quotient 6 as the next digit in the result. 
Result so far: 166.0
Deduct 240 from 264 and we're left with 24.
Fetch the next digit (4) from the dividend, attach it to 24 and continue: 244 / 40

Going ahead to step 5:
When dividing 244 by 40, we get 6 with a remainder of 4.
The next digit of our result is 6. 
Result so far: 1666.0
If we subtract 240 from 244, we get 4.
Append the next digit (6) from the dividend to 4 and continue with: 46 / 40

Going ahead to step 6:
40 can be fit into 46 1 times, resulting in a remainder of 6.
The next digit of our result is 1. 
Result so far: 16661.0
Subtract 40 from 46 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 7:
40 goes into 60 1 times with a remainder of 20.
The next digit of our result is 1. 
Result so far: 16661.1
Subtracting 40 from 60 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.

Moving on to step 8:
When dividing 200 by 40, we get 5 with a remainder of 0.
The next digit of our result is 5. 
Result so far: 16661.15
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.

Going ahead to step 9:
If we divide 0 by 40, we get 0 and a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 16661.15
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.

Let's proceed to step 10:
When dividing 0 by 40, we get 0 with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 16661.15
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.

After the division, we end up with 16661.15 and a remainder of 0.0.