We look at the division of 4032625 by 18 
The aim is to understand the frequency of 18 in 4032625.

Advancing to step 1:
4 divided by 18 is 0 with a remainder of 4.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 4 and we're left with 4.
Bring next digit (0) of the dividend behind the 4 and repeat the process: 40 / 18

Advancing to step 2:
40 divided by 18 is 2 with a remainder of 4.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
Deduct 36 from 40 and we're left with 4.
Bring next digit (3) of the dividend behind the 4 and repeat the process: 43 / 18

Moving on to step 3:
The number 18 fits into 43 2 times, leaving a remainder of 7.
Write down 2 as next digit of the result. 
Result so far: 22.0
Subtracting 36 from 43 leaves us with 7.
Take the next digit (2) from the dividend and append it to 7, then repeat: 72 / 18

On to step 4:
18 goes into 72 4 times with a remainder of 0.
Write down 4 as next digit of the result. 
Result so far: 224.0
Deduct 72 from 72 and we're left with 0.
Fetch the next digit (6) from the dividend, attach it to 0 and continue: 6 / 18

Going ahead to step 5:
If we divide 6 by 18, we get 0 and a remainder of 6.
Put 0 as the next digit of the answer. 
Result so far: 2240.0
If we take 0 away from 6, we end up with 6.
Grab the next digit (2) from the dividend, add it to 6, then carry on: 62 / 18

Going ahead to step 6:
If we divide 62 by 18, we get 3 and a remainder of 8.
Write down 3 as next digit of the result. 
Result so far: 22403.0
Subtract 54 from 62 to get 8.
Take the next digit (5) from the dividend and append it to 8, then repeat: 85 / 18

Let's proceed to step 7:
18 goes into 85 4 times with a remainder of 13.
Write down 4 as next digit of the result. 
Result so far: 224034.0
Deduct 72 from 85 and we're left with 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Step 8:
When dividing 130 by 18, we get 7 with a remainder of 4.
Put 7 as the next digit of the answer. 
Result so far: 224034.7
Subtracting 126 from 130 leaves us with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Let's proceed to step 9:
40 divided by 18 is 2 with a remainder of 4.
Record the quotient 2 as the next digit in the result. 
Result so far: 224034.72
The remainder is 4 after subtracting 36 from 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Step 10:
18 goes into 40 2 times with a remainder of 4.
Record the quotient 2 as the next digit in the result. 
Result so far: 224034.722
Subtracting 36 from 40 leaves us with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

The final outcome is 224034.722, with a leftover of 0.0004.