We're dividing 436989 by 42 
The aim is to understand the frequency of 42 in 436989.

Moving on to step 1:
The number 42 fits into 4 0 times, leaving a remainder of 4.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 4 to get 4.
Include the next digit (3) from the dividend after 4, then repeat: 43 / 42

Going ahead to step 2:
42 goes into 43 1 times with a remainder of 1.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Subtract 42 from 43 to get 1.
Append the next digit (6) from the dividend to 1 and continue with: 16 / 42

Moving on to step 3:
42 goes into 16 0 times with a remainder of 16.
Write down 0 as next digit of the result. 
Result so far: 10.0
Subtracting 0 from 16 leaves us with 16.
Include the next digit (9) from the dividend after 16, then repeat: 169 / 42

Step 4:
If we divide 169 by 42, we get 4 and a remainder of 1.
The number 4 becomes the next digit in our result. 
Result so far: 104.0
The remainder is 1 after subtracting 168 from 169.
Grab the next digit (8) from the dividend, add it to 1, then carry on: 18 / 42

Going ahead to step 5:
If we divide 18 by 42, we get 0 and a remainder of 18.
Put 0 as the next digit of the answer. 
Result so far: 1040.0
If we subtract 0 from 18, we get 18.
Append the next digit (9) from the dividend to 18 and continue with: 189 / 42

Let's proceed to step 6:
42 can be fit into 189 4 times, resulting in a remainder of 21.
Use 4 as the next digit of our solution. 
Result so far: 10404.0
Subtract 168 from 189 to get 21.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

Step 7:
When dividing 210 by 42, we get 5 with a remainder of 0.
The next digit of our result is 5. 
Result so far: 10404.5
Subtract 210 from 210 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.

Moving on to step 8:
0 divided by 42 is 0 with a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 10404.5
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.

On to step 9:
If we divide 0 by 42, we get 0 and a remainder of 0.
The number 0 becomes the next digit in our result. 
Result so far: 10404.5
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.

The final outcome is 10404.5, with a leftover of 0.0.