We look at the division of 51192370 by 45 
The aim is to understand the frequency of 45 in 51192370.

Moving on to step 1:
45 can be fit into 5 0 times, resulting in a remainder of 5.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 5 to get 5.
Grab the next digit (1) from the dividend, add it to 5, then carry on: 51 / 45

Step 2:
If we divide 51 by 45, we get 1 and a remainder of 6.
Put 1 as the next digit of the answer. 
Result so far: 1.0
If we take 45 away from 51, we end up with 6.
Take the next digit (1) from the dividend and append it to 6, then repeat: 61 / 45

Let's proceed to step 3:
The number 45 fits into 61 1 times, leaving a remainder of 16.
The next digit of our result is 1. 
Result so far: 11.0
The remainder is 16 after subtracting 45 from 61.
Grab the next digit (9) from the dividend, add it to 16, then carry on: 169 / 45

On to step 4:
169 divided by 45 is 3 with a remainder of 34.
Put 3 as the next digit of the answer. 
Result so far: 113.0
The remainder is 34 after subtracting 135 from 169.
Bring next digit (2) of the dividend behind the 34 and repeat the process: 342 / 45

Advancing to step 5:
If we divide 342 by 45, we get 7 and a remainder of 27.
The number 7 becomes the next digit in our result. 
Result so far: 1137.0
The remainder is 27 after subtracting 315 from 342.
Fetch the next digit (3) from the dividend, attach it to 27 and continue: 273 / 45

Step 6:
The number 45 fits into 273 6 times, leaving a remainder of 3.
Write down 6 as next digit of the result. 
Result so far: 11376.0
If we subtract 270 from 273, we get 3.
Bring next digit (7) of the dividend behind the 3 and repeat the process: 37 / 45

Step 7:
If we divide 37 by 45, we get 0 and a remainder of 37.
The number 0 becomes the next digit in our result. 
Result so far: 113760.0
The remainder is 37 after subtracting 0 from 37.
Append the next digit (0) from the dividend to 37 and continue with: 370 / 45

On to step 8:
45 can be fit into 370 8 times, resulting in a remainder of 10.
Put 8 as the next digit of the answer. 
Result so far: 1137608.0
Subtracting 360 from 370 leaves us with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Going ahead to step 9:
45 can be fit into 100 2 times, resulting in a remainder of 10.
Record the quotient 2 as the next digit in the result. 
Result so far: 1137608.2
If we take 90 away from 100, we end up with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Step 10:
The number 45 fits into 100 2 times, leaving a remainder of 10.
The next digit of our result is 2. 
Result so far: 1137608.22
The remainder is 10 after subtracting 90 from 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

After the division, we end up with 1137608.22 and a remainder of 0.01.