800190 ÷ 18 
The aim is to understand the frequency of 18 in 800190.

Moving on to step 1:
18 goes into 8 0 times with a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 8, we get 8.
Grab the next digit (0) from the dividend, add it to 8, then carry on: 80 / 18

Moving on to step 2:
If we divide 80 by 18, we get 4 and a remainder of 8.
The number 4 becomes the next digit in our result. 
Result so far: 4.0
Subtract 72 from 80 to get 8.
Append the next digit (0) from the dividend to 8 and continue with: 80 / 18

On to step 3:
The number 18 fits into 80 4 times, leaving a remainder of 8.
Put 4 as the next digit of the answer. 
Result so far: 44.0
If we take 72 away from 80, we end up with 8.
Take the next digit (1) from the dividend and append it to 8, then repeat: 81 / 18

Going ahead to step 4:
81 divided by 18 is 4 with a remainder of 9.
Record the quotient 4 as the next digit in the result. 
Result so far: 444.0
Deduct 72 from 81 and we're left with 9.
Take the next digit (9) from the dividend and append it to 9, then repeat: 99 / 18

Step 5:
If we divide 99 by 18, we get 5 and a remainder of 9.
Use 5 as the next digit of our solution. 
Result so far: 4445.0
The remainder is 9 after subtracting 90 from 99.
Grab the next digit (0) from the dividend, add it to 9, then carry on: 90 / 18

Advancing to step 6:
18 can be fit into 90 5 times, resulting in a remainder of 0.
The number 5 becomes the next digit in our result. 
Result so far: 44455.0
If we take 90 away from 90, 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.

Advancing to step 7:
0 divided by 18 is 0 with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 44455.0
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.

Advancing to step 8:
When dividing 0 by 18, we get 0 with a remainder of 0.
The next digit of our result is 0. 
Result so far: 44455.0
Subtract 0 from 0 to 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.

The final result is 44455.0 with a remainder of 0.0.