We're dividing 149686 by 45 
The aim is to understand the frequency of 45 in 149686.

Step 1:
If we divide 1 by 45, we get 0 and a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 1 and we're left with 1.
Append the next digit (4) from the dividend to 1 and continue with: 14 / 45

Step 2:
The number 45 fits into 14 0 times, leaving a remainder of 14.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 14, we get 14.
Take the next digit (9) from the dividend and append it to 14, then repeat: 149 / 45

Let's proceed to step 3:
The number 45 fits into 149 3 times, leaving a remainder of 14.
Use 3 as the next digit of our solution. 
Result so far: 3.0
Subtracting 135 from 149 leaves us with 14.
Fetch the next digit (6) from the dividend, attach it to 14 and continue: 146 / 45

Step 4:
If we divide 146 by 45, we get 3 and a remainder of 11.
Record the quotient 3 as the next digit in the result. 
Result so far: 33.0
Subtracting 135 from 146 leaves us with 11.
Append the next digit (8) from the dividend to 11 and continue with: 118 / 45

Advancing to step 5:
45 goes into 118 2 times with a remainder of 28.
Record the quotient 2 as the next digit in the result. 
Result so far: 332.0
The remainder is 28 after subtracting 90 from 118.
Grab the next digit (6) from the dividend, add it to 28, then carry on: 286 / 45

Advancing to step 6:
If we divide 286 by 45, we get 6 and a remainder of 16.
The next digit of our result is 6. 
Result so far: 3326.0
Subtract 270 from 286 to get 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Going ahead to step 7:
45 goes into 160 3 times with a remainder of 25.
The number 3 becomes the next digit in our result. 
Result so far: 3326.3
The remainder is 25 after subtracting 135 from 160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

Going ahead to step 8:
If we divide 250 by 45, we get 5 and a remainder of 25.
Use 5 as the next digit of our solution. 
Result so far: 3326.35
Subtracting 225 from 250 leaves us with 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

Step 9:
250 divided by 45 is 5 with a remainder of 25.
Use 5 as the next digit of our solution. 
Result so far: 3326.355
Subtracting 225 from 250 leaves us with 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

The final outcome is 3326.355, with a leftover of 0.0025.