We look at the division of 591111 by 45 
The aim is to understand the frequency of 45 in 591111.

Let's proceed to step 1:
5 divided by 45 is 0 with a remainder of 5.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 5, we get 5.
Fetch the next digit (9) from the dividend, attach it to 5 and continue: 59 / 45

Advancing to step 2:
When dividing 59 by 45, we get 1 with a remainder of 14.
Put 1 as the next digit of the answer. 
Result so far: 1.0
The remainder is 14 after subtracting 45 from 59.
Fetch the next digit (1) from the dividend, attach it to 14 and continue: 141 / 45

Advancing to step 3:
45 goes into 141 3 times with a remainder of 6.
Use 3 as the next digit of our solution. 
Result so far: 13.0
Subtracting 135 from 141 leaves us with 6.
Take the next digit (1) from the dividend and append it to 6, then repeat: 61 / 45

Let's proceed to step 4:
45 can be fit into 61 1 times, resulting in a remainder of 16.
The next digit of our result is 1. 
Result so far: 131.0
If we take 45 away from 61, we end up with 16.
Fetch the next digit (1) from the dividend, attach it to 16 and continue: 161 / 45

Moving on to step 5:
The number 45 fits into 161 3 times, leaving a remainder of 26.
The next digit of our result is 3. 
Result so far: 1313.0
Deduct 135 from 161 and we're left with 26.
Append the next digit (1) from the dividend to 26 and continue with: 261 / 45

On to step 6:
45 can be fit into 261 5 times, resulting in a remainder of 36.
Use 5 as the next digit of our solution. 
Result so far: 13135.0
Deduct 225 from 261 and we're left with 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

On to step 7:
When dividing 360 by 45, we get 8 with a remainder of 0.
The number 8 becomes the next digit in our result. 
Result so far: 13135.8
Subtracting 360 from 360 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

On to step 8:
If we divide 0 by 45, we get 0 and a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 13135.8
Subtracting 0 from 0 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Let's proceed to step 9:
45 goes into 0 0 times with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 13135.8
If we take 0 away from 0, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

After the division, we end up with 13135.8 and a remainder of 0.0.