We look at the division of 673683 by 45 
The aim is to understand the frequency of 45 in 673683.

Going ahead to step 1:
The number 45 fits into 6 0 times, leaving a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Fetch the next digit (7) from the dividend, attach it to 6 and continue: 67 / 45

On to step 2:
If we divide 67 by 45, we get 1 and a remainder of 22.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
If we take 45 away from 67, we end up with 22.
Fetch the next digit (3) from the dividend, attach it to 22 and continue: 223 / 45

Going ahead to step 3:
If we divide 223 by 45, we get 4 and a remainder of 43.
Write down 4 as next digit of the result. 
Result so far: 14.0
If we take 180 away from 223, we end up with 43.
Grab the next digit (6) from the dividend, add it to 43, then carry on: 436 / 45

On to step 4:
436 divided by 45 is 9 with a remainder of 31.
Write down 9 as next digit of the result. 
Result so far: 149.0
If we subtract 405 from 436, we get 31.
Fetch the next digit (8) from the dividend, attach it to 31 and continue: 318 / 45

Going ahead to step 5:
45 can be fit into 318 7 times, resulting in a remainder of 3.
Use 7 as the next digit of our solution. 
Result so far: 1497.0
Subtracting 315 from 318 leaves us with 3.
Grab the next digit (3) from the dividend, add it to 3, then carry on: 33 / 45

Advancing to step 6:
The number 45 fits into 33 0 times, leaving a remainder of 33.
The number 0 becomes the next digit in our result. 
Result so far: 14970.0
Subtract 0 from 33 to get 33.
Since there are no more digits in the dividend, we add a zero to the remainder making it 330, and continue the process.

Going ahead to step 7:
45 goes into 330 7 times with a remainder of 15.
Use 7 as the next digit of our solution. 
Result so far: 14970.7
If we take 315 away from 330, we end up with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Going ahead to step 8:
If we divide 150 by 45, we get 3 and a remainder of 15.
Use 3 as the next digit of our solution. 
Result so far: 14970.73
If we take 135 away from 150, we end up with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Moving on to step 9:
The number 45 fits into 150 3 times, leaving a remainder of 15.
Put 3 as the next digit of the answer. 
Result so far: 14970.733
If we take 135 away from 150, we end up with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

The final result is 14970.733 with a remainder of 0.0015.