45603604 divided by 3 
The aim is to understand the frequency of 3 in 45603604.

Moving on to step 1:
If we divide 4 by 3, we get 1 and a remainder of 1.
Put 1 as the next digit of the answer. 
Result so far: 1.0
If we take 3 away from 4, we end up with 1.
Fetch the next digit (5) from the dividend, attach it to 1 and continue: 15 / 3

Moving on to step 2:
3 can be fit into 15 5 times, resulting in a remainder of 0.
Record the quotient 5 as the next digit in the result. 
Result so far: 15.0
The remainder is 0 after subtracting 15 from 15.
Take the next digit (6) from the dividend and append it to 0, then repeat: 6 / 3

Step 3:
6 divided by 3 is 2 with a remainder of 0.
Put 2 as the next digit of the answer. 
Result so far: 152.0
Deduct 6 from 6 and we're left with 0.
Include the next digit (0) from the dividend after 0, then repeat: 0 / 3

Going ahead to step 4:
3 can be fit into 0 0 times, resulting in a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 1520.0
If we take 0 away from 0, we end up with 0.
Grab the next digit (3) from the dividend, add it to 0, then carry on: 3 / 3

Let's proceed to step 5:
When dividing 3 by 3, we get 1 with a remainder of 0.
The number 1 becomes the next digit in our result. 
Result so far: 15201.0
Deduct 3 from 3 and we're left with 0.
Grab the next digit (6) from the dividend, add it to 0, then carry on: 6 / 3

Going ahead to step 6:
3 goes into 6 2 times with a remainder of 0.
The next digit of our result is 2. 
Result so far: 152012.0
Subtract 6 from 6 to get 0.
Include the next digit (0) from the dividend after 0, then repeat: 0 / 3

Let's proceed to step 7:
3 goes into 0 0 times with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 1520120.0
If we subtract 0 from 0, we get 0.
Grab the next digit (4) from the dividend, add it to 0, then carry on: 4 / 3

On to step 8:
The number 3 fits into 4 1 times, leaving a remainder of 1.
Use 1 as the next digit of our solution. 
Result so far: 15201201.0
Subtract 3 from 4 to get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Let's proceed to step 9:
3 can be fit into 10 3 times, resulting in a remainder of 1.
Record the quotient 3 as the next digit in the result. 
Result so far: 15201201.3
The remainder is 1 after subtracting 9 from 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Advancing to step 10:
3 can be fit into 10 3 times, resulting in a remainder of 1.
The number 3 becomes the next digit in our result. 
Result so far: 15201201.33
If we subtract 9 from 10, we get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Our division results in 15201201.33 with a remaining 0.001.