We're dividing 45432321 by 1 
The aim is to understand the frequency of 1 in 45432321.

Moving on to step 1:
If we divide 4 by 1, we get 4 and a remainder of 0.
Put 4 as the next digit of the answer. 
Result so far: 4.0
The remainder is 0 after subtracting 4 from 4.
Fetch the next digit (5) from the dividend, attach it to 0 and continue: 5 / 1

Advancing to step 2:
1 goes into 5 5 times with a remainder of 0.
Record the quotient 5 as the next digit in the result. 
Result so far: 45.0
Subtract 5 from 5 to get 0.
Include the next digit (4) from the dividend after 0, then repeat: 4 / 1

On to step 3:
If we divide 4 by 1, we get 4 and a remainder of 0.
Put 4 as the next digit of the answer. 
Result so far: 454.0
If we subtract 4 from 4, we get 0.
Include the next digit (3) from the dividend after 0, then repeat: 3 / 1

Advancing to step 4:
If we divide 3 by 1, we get 3 and a remainder of 0.
Put 3 as the next digit of the answer. 
Result so far: 4543.0
Subtract 3 from 3 to get 0.
Take the next digit (2) from the dividend and append it to 0, then repeat: 2 / 1

Going ahead to step 5:
When dividing 2 by 1, we get 2 with a remainder of 0.
The next digit of our result is 2. 
Result so far: 45432.0
Deduct 2 from 2 and we're left with 0.
Append the next digit (3) from the dividend to 0 and continue with: 3 / 1

Advancing to step 6:
1 can be fit into 3 3 times, resulting in a remainder of 0.
Put 3 as the next digit of the answer. 
Result so far: 454323.0
Deduct 3 from 3 and we're left with 0.
Include the next digit (2) from the dividend after 0, then repeat: 2 / 1

On to step 7:
If we divide 2 by 1, we get 2 and a remainder of 0.
Record the quotient 2 as the next digit in the result. 
Result so far: 4543232.0
If we subtract 2 from 2, we get 0.
Grab the next digit (1) from the dividend, add it to 0, then carry on: 1 / 1

On to step 8:
1 can be fit into 1 1 times, resulting in a remainder of 0.
Record the quotient 1 as the next digit in the result. 
Result so far: 45432321.0
If we take 1 away from 1, 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.

Going ahead to step 9:
1 goes into 0 0 times with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 45432321.0
If we subtract 0 from 0, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 10:
When dividing 0 by 1, we get 0 with a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 45432321.0
Deduct 0 from 0 and we're left 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 45432321.0 and a remainder of 0.0.