85900404 divided by 420 
The aim is to understand the frequency of 420 in 85900404.

Let's proceed to step 1:
420 goes into 8 0 times with a remainder of 8.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 8 to get 8.
Grab the next digit (5) from the dividend, add it to 8, then carry on: 85 / 420

On to step 2:
The number 420 fits into 85 0 times, leaving a remainder of 85.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 85, we end up with 85.
Take the next digit (9) from the dividend and append it to 85, then repeat: 859 / 420

Moving on to step 3:
859 divided by 420 is 2 with a remainder of 19.
The next digit of our result is 2. 
Result so far: 2.0
If we take 840 away from 859, we end up with 19.
Grab the next digit (0) from the dividend, add it to 19, then carry on: 190 / 420

Advancing to step 4:
420 goes into 190 0 times with a remainder of 190.
Write down 0 as next digit of the result. 
Result so far: 20.0
If we subtract 0 from 190, we get 190.
Fetch the next digit (0) from the dividend, attach it to 190 and continue: 1900 / 420

On to step 5:
420 goes into 1900 4 times with a remainder of 220.
Use 4 as the next digit of our solution. 
Result so far: 204.0
If we take 1680 away from 1900, we end up with 220.
Grab the next digit (4) from the dividend, add it to 220, then carry on: 2204 / 420

On to step 6:
If we divide 2204 by 420, we get 5 and a remainder of 104.
Use 5 as the next digit of our solution. 
Result so far: 2045.0
Subtract 2100 from 2204 to get 104.
Take the next digit (0) from the dividend and append it to 104, then repeat: 1040 / 420

Step 7:
The number 420 fits into 1040 2 times, leaving a remainder of 200.
Write down 2 as next digit of the result. 
Result so far: 20452.0
Subtract 840 from 1040 to get 200.
Take the next digit (4) from the dividend and append it to 200, then repeat: 2004 / 420

On to step 8:
420 can be fit into 2004 4 times, resulting in a remainder of 324.
The next digit of our result is 4. 
Result so far: 204524.0
Subtract 1680 from 2004 to get 324.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3240, and continue the process.

Let's proceed to step 9:
The number 420 fits into 3240 7 times, leaving a remainder of 300.
The next digit of our result is 7. 
Result so far: 204524.7
Subtract 2940 from 3240 to get 300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3000, and continue the process.

Let's proceed to step 10:
When dividing 3000 by 420, we get 7 with a remainder of 60.
Put 7 as the next digit of the answer. 
Result so far: 204524.77
Subtracting 2940 from 3000 leaves us with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

After the division, we end up with 204524.77 and a remainder of 0.06.