90468888 ÷ 42 
The aim is to understand the frequency of 42 in 90468888.

Step 1:
9 divided by 42 is 0 with a remainder of 9.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 9, we get 9.
Take the next digit (0) from the dividend and append it to 9, then repeat: 90 / 42

Let's proceed to step 2:
When dividing 90 by 42, we get 2 with a remainder of 6.
Use 2 as the next digit of our solution. 
Result so far: 2.0
If we subtract 84 from 90, we get 6.
Fetch the next digit (4) from the dividend, attach it to 6 and continue: 64 / 42

Going ahead to step 3:
When dividing 64 by 42, we get 1 with a remainder of 22.
Write down 1 as next digit of the result. 
Result so far: 21.0
If we subtract 42 from 64, we get 22.
Append the next digit (6) from the dividend to 22 and continue with: 226 / 42

Step 4:
When dividing 226 by 42, we get 5 with a remainder of 16.
Record the quotient 5 as the next digit in the result. 
Result so far: 215.0
The remainder is 16 after subtracting 210 from 226.
Take the next digit (8) from the dividend and append it to 16, then repeat: 168 / 42

On to step 5:
168 divided by 42 is 4 with a remainder of 0.
Put 4 as the next digit of the answer. 
Result so far: 2154.0
If we take 168 away from 168, we end up with 0.
Bring next digit (8) of the dividend behind the 0 and repeat the process: 8 / 42

Moving on to step 6:
The number 42 fits into 8 0 times, leaving a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 21540.0
Deduct 0 from 8 and we're left with 8.
Append the next digit (8) from the dividend to 8 and continue with: 88 / 42

Going ahead to step 7:
If we divide 88 by 42, we get 2 and a remainder of 4.
Write down 2 as next digit of the result. 
Result so far: 215402.0
If we take 84 away from 88, we end up with 4.
Take the next digit (8) from the dividend and append it to 4, then repeat: 48 / 42

Advancing to step 8:
The number 42 fits into 48 1 times, leaving a remainder of 6.
The number 1 becomes the next digit in our result. 
Result so far: 2154021.0
Subtract 42 from 48 to get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Going ahead to step 9:
If we divide 60 by 42, we get 1 and a remainder of 18.
Use 1 as the next digit of our solution. 
Result so far: 2154021.1
If we subtract 42 from 60, we get 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Going ahead to step 10:
The number 42 fits into 180 4 times, leaving a remainder of 12.
The number 4 becomes the next digit in our result. 
Result so far: 2154021.14
If we subtract 168 from 180, we get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Going ahead to step 11:
42 can be fit into 120 2 times, resulting in a remainder of 36.
The next digit of our result is 2. 
Result so far: 2154021.142
If we subtract 84 from 120, we get 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Moving on to step 12:
360 divided by 42 is 8 with a remainder of 24.
Use 8 as the next digit of our solution. 
Result so far: 2154021.1428
If we take 336 away from 360, we end up with 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Advancing to step 13:
If we divide 240 by 42, we get 5 and a remainder of 30.
Record the quotient 5 as the next digit in the result. 
Result so far: 2154021.14285
Deduct 210 from 240 and we're left with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Going ahead to step 14:
300 divided by 42 is 7 with a remainder of 6.
Use 7 as the next digit of our solution. 
Result so far: 2154021.142857
Deduct 294 from 300 and we're left with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Step 15:
When dividing 60 by 42, we get 1 with a remainder of 18.
Put 1 as the next digit of the answer. 
Result so far: 2154021.1428571
If we subtract 42 from 60, we get 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

On to step 16:
When dividing 180 by 42, we get 4 with a remainder of 12.
The number 4 becomes the next digit in our result. 
Result so far: 2154021.14285714
Subtracting 168 from 180 leaves us with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

The final result is 2154021.14285714 with a remainder of 1.2e-08.