We look at the division of 65379529 by 420 
The aim is to understand the frequency of 420 in 65379529.

Step 1:
If we divide 6 by 420, we get 0 and a remainder of 6.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Bring next digit (5) of the dividend behind the 6 and repeat the process: 65 / 420

Let's proceed to step 2:
The number 420 fits into 65 0 times, leaving a remainder of 65.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 65, we get 65.
Include the next digit (3) from the dividend after 65, then repeat: 653 / 420

Moving on to step 3:
When dividing 653 by 420, we get 1 with a remainder of 233.
The next digit of our result is 1. 
Result so far: 1.0
If we take 420 away from 653, we end up with 233.
Grab the next digit (7) from the dividend, add it to 233, then carry on: 2337 / 420

Step 4:
The number 420 fits into 2337 5 times, leaving a remainder of 237.
The next digit of our result is 5. 
Result so far: 15.0
If we take 2100 away from 2337, we end up with 237.
Take the next digit (9) from the dividend and append it to 237, then repeat: 2379 / 420

Going ahead to step 5:
2379 divided by 420 is 5 with a remainder of 279.
Record the quotient 5 as the next digit in the result. 
Result so far: 155.0
If we take 2100 away from 2379, we end up with 279.
Take the next digit (5) from the dividend and append it to 279, then repeat: 2795 / 420

On to step 6:
When dividing 2795 by 420, we get 6 with a remainder of 275.
Write down 6 as next digit of the result. 
Result so far: 1556.0
The remainder is 275 after subtracting 2520 from 2795.
Append the next digit (2) from the dividend to 275 and continue with: 2752 / 420

On to step 7:
420 can be fit into 2752 6 times, resulting in a remainder of 232.
Use 6 as the next digit of our solution. 
Result so far: 15566.0
If we subtract 2520 from 2752, we get 232.
Fetch the next digit (9) from the dividend, attach it to 232 and continue: 2329 / 420

Step 8:
420 goes into 2329 5 times with a remainder of 229.
Use 5 as the next digit of our solution. 
Result so far: 155665.0
If we subtract 2100 from 2329, we get 229.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2290, and continue the process.

Step 9:
2290 divided by 420 is 5 with a remainder of 190.
The number 5 becomes the next digit in our result. 
Result so far: 155665.5
If we subtract 2100 from 2290, we get 190.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1900, and continue the process.

Let's proceed to step 10:
When dividing 1900 by 420, we get 4 with a remainder of 220.
Write down 4 as next digit of the result. 
Result so far: 155665.54
Subtract 1680 from 1900 to get 220.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2200, and continue the process.

Moving on to step 11:
2200 divided by 420 is 5 with a remainder of 100.
Write down 5 as next digit of the result. 
Result so far: 155665.545
If we take 2100 away from 2200, we end up with 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1000, and continue the process.

Let's proceed to step 12:
If we divide 1000 by 420, we get 2 and a remainder of 160.
The number 2 becomes the next digit in our result. 
Result so far: 155665.5452
If we subtract 840 from 1000, we get 160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1600, and continue the process.

Moving on to step 13:
The number 420 fits into 1600 3 times, leaving a remainder of 340.
Record the quotient 3 as the next digit in the result. 
Result so far: 155665.54523
If we take 1260 away from 1600, we end up with 340.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3400, and continue the process.

On to step 14:
420 goes into 3400 8 times with a remainder of 40.
Write down 8 as next digit of the result. 
Result so far: 155665.545238
Subtracting 3360 from 3400 leaves us with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Moving on to step 15:
400 divided by 420 is 0 with a remainder of 400.
Write down 0 as next digit of the result. 
Result so far: 155665.545238
If we subtract 0 from 400, we get 400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4000, and continue the process.

Let's proceed to step 16:
If we divide 4000 by 420, we get 9 and a remainder of 220.
Use 9 as the next digit of our solution. 
Result so far: 155665.54523809
Subtract 3780 from 4000 to get 220.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2200, and continue the process.

In conclusion, the division gives 155665.54523809 with a balance of 2.2e-07.