667991 divided by 45 
The aim is to understand the frequency of 45 in 667991.

Going ahead to step 1:
45 can be fit into 6 0 times, resulting in a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 6 to get 6.
Take the next digit (6) from the dividend and append it to 6, then repeat: 66 / 45

Advancing to step 2:
45 can be fit into 66 1 times, resulting in a remainder of 21.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Deduct 45 from 66 and we're left with 21.
Append the next digit (7) from the dividend to 21 and continue with: 217 / 45

Let's proceed to step 3:
217 divided by 45 is 4 with a remainder of 37.
Record the quotient 4 as the next digit in the result. 
Result so far: 14.0
The remainder is 37 after subtracting 180 from 217.
Grab the next digit (9) from the dividend, add it to 37, then carry on: 379 / 45

Going ahead to step 4:
45 can be fit into 379 8 times, resulting in a remainder of 19.
Record the quotient 8 as the next digit in the result. 
Result so far: 148.0
Subtract 360 from 379 to get 19.
Grab the next digit (9) from the dividend, add it to 19, then carry on: 199 / 45

Going ahead to step 5:
The number 45 fits into 199 4 times, leaving a remainder of 19.
Write down 4 as next digit of the result. 
Result so far: 1484.0
Deduct 180 from 199 and we're left with 19.
Include the next digit (1) from the dividend after 19, then repeat: 191 / 45

On to step 6:
45 goes into 191 4 times with a remainder of 11.
Use 4 as the next digit of our solution. 
Result so far: 14844.0
The remainder is 11 after subtracting 180 from 191.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Moving on to step 7:
45 can be fit into 110 2 times, resulting in a remainder of 20.
The number 2 becomes the next digit in our result. 
Result so far: 14844.2
Deduct 90 from 110 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 8:
When dividing 200 by 45, we get 4 with a remainder of 20.
The next digit of our result is 4. 
Result so far: 14844.24
The remainder is 20 after subtracting 180 from 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Step 9:
The number 45 fits into 200 4 times, leaving a remainder of 20.
The number 4 becomes the next digit in our result. 
Result so far: 14844.244
Subtract 180 from 200 to get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

The final outcome is 14844.244, with a leftover of 0.002.