We look at the division of 723761 by 45 
The aim is to understand the frequency of 45 in 723761.

Let's proceed to step 1:
If we divide 7 by 45, we get 0 and a remainder of 7.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 7, we end up with 7.
Bring next digit (2) of the dividend behind the 7 and repeat the process: 72 / 45

Step 2:
45 goes into 72 1 times with a remainder of 27.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
The remainder is 27 after subtracting 45 from 72.
Take the next digit (3) from the dividend and append it to 27, then repeat: 273 / 45

Advancing to step 3:
273 divided by 45 is 6 with a remainder of 3.
Write down 6 as next digit of the result. 
Result so far: 16.0
Subtract 270 from 273 to get 3.
Grab the next digit (7) from the dividend, add it to 3, then carry on: 37 / 45

Going ahead to step 4:
37 divided by 45 is 0 with a remainder of 37.
Put 0 as the next digit of the answer. 
Result so far: 160.0
If we take 0 away from 37, we end up with 37.
Bring next digit (6) of the dividend behind the 37 and repeat the process: 376 / 45

Going ahead to step 5:
When dividing 376 by 45, we get 8 with a remainder of 16.
Use 8 as the next digit of our solution. 
Result so far: 1608.0
Subtracting 360 from 376 leaves us with 16.
Include the next digit (1) from the dividend after 16, then repeat: 161 / 45

Moving on to step 6:
When dividing 161 by 45, we get 3 with a remainder of 26.
Record the quotient 3 as the next digit in the result. 
Result so far: 16083.0
Subtract 135 from 161 to get 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Moving on to step 7:
45 goes into 260 5 times with a remainder of 35.
Use 5 as the next digit of our solution. 
Result so far: 16083.5
Subtracting 225 from 260 leaves us 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.

On to step 8:
45 can be fit into 350 7 times, resulting in a remainder of 35.
The number 7 becomes the next digit in our result. 
Result so far: 16083.57
Subtracting 315 from 350 leaves us 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.

Moving on to step 9:
45 can be fit into 350 7 times, resulting in a remainder of 35.
Put 7 as the next digit of the answer. 
Result so far: 16083.577
Deduct 315 from 350 and we're left 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.

The quotient of the division is 16083.577, and the remainder is 0.0035.