We look at the division of 637442 by 45 
The aim is to understand the frequency of 45 in 637442.

On to step 1:
If we divide 6 by 45, we get 0 and a remainder of 6.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 6 and we're left with 6.
Fetch the next digit (3) from the dividend, attach it to 6 and continue: 63 / 45

Step 2:
45 goes into 63 1 times with a remainder of 18.
Write down 1 as next digit of the result. 
Result so far: 1.0
Subtract 45 from 63 to get 18.
Grab the next digit (7) from the dividend, add it to 18, then carry on: 187 / 45

Let's proceed to step 3:
If we divide 187 by 45, we get 4 and a remainder of 7.
The number 4 becomes the next digit in our result. 
Result so far: 14.0
Subtracting 180 from 187 leaves us with 7.
Grab the next digit (4) from the dividend, add it to 7, then carry on: 74 / 45

Let's proceed to step 4:
74 divided by 45 is 1 with a remainder of 29.
Put 1 as the next digit of the answer. 
Result so far: 141.0
If we subtract 45 from 74, we get 29.
Append the next digit (4) from the dividend to 29 and continue with: 294 / 45

Going ahead to step 5:
The number 45 fits into 294 6 times, leaving a remainder of 24.
Use 6 as the next digit of our solution. 
Result so far: 1416.0
Subtract 270 from 294 to get 24.
Append the next digit (2) from the dividend to 24 and continue with: 242 / 45

Advancing to step 6:
45 can be fit into 242 5 times, resulting in a remainder of 17.
Record the quotient 5 as the next digit in the result. 
Result so far: 14165.0
Subtracting 225 from 242 leaves us with 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Advancing to step 7:
When dividing 170 by 45, we get 3 with a remainder of 35.
The next digit of our result is 3. 
Result so far: 14165.3
If we take 135 away from 170, we end up with 35.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

Advancing to step 8:
350 divided by 45 is 7 with a remainder of 35.
The next digit of our result is 7. 
Result so far: 14165.37
Subtract 315 from 350 to get 35.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

Going ahead to step 9:
The number 45 fits into 350 7 times, leaving a remainder of 35.
The number 7 becomes the next digit in our result. 
Result so far: 14165.377
The remainder is 35 after subtracting 315 from 350.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

The quotient of the division is 14165.377, and the remainder is 0.0035.