We look at the division of 9684990 by 420 
The aim is to understand the frequency of 420 in 9684990.

Moving on to step 1:
If we divide 9 by 420, we get 0 and a remainder of 9.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 9 leaves us with 9.
Grab the next digit (6) from the dividend, add it to 9, then carry on: 96 / 420

Going ahead to step 2:
96 divided by 420 is 0 with a remainder of 96.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 96 to get 96.
Append the next digit (8) from the dividend to 96 and continue with: 968 / 420

Step 3:
420 can be fit into 968 2 times, resulting in a remainder of 128.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
If we subtract 840 from 968, we get 128.
Bring next digit (4) of the dividend behind the 128 and repeat the process: 1284 / 420

Step 4:
1284 divided by 420 is 3 with a remainder of 24.
Write down 3 as next digit of the result. 
Result so far: 23.0
Deduct 1260 from 1284 and we're left with 24.
Include the next digit (9) from the dividend after 24, then repeat: 249 / 420

Moving on to step 5:
420 can be fit into 249 0 times, resulting in a remainder of 249.
The next digit of our result is 0. 
Result so far: 230.0
If we take 0 away from 249, we end up with 249.
Fetch the next digit (9) from the dividend, attach it to 249 and continue: 2499 / 420

On to step 6:
The number 420 fits into 2499 5 times, leaving a remainder of 399.
The next digit of our result is 5. 
Result so far: 2305.0
The remainder is 399 after subtracting 2100 from 2499.
Take the next digit (0) from the dividend and append it to 399, then repeat: 3990 / 420

Step 7:
3990 divided by 420 is 9 with a remainder of 210.
Put 9 as the next digit of the answer. 
Result so far: 23059.0
If we subtract 3780 from 3990, we get 210.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2100, and continue the process.

Step 8:
420 goes into 2100 5 times with a remainder of 0.
Use 5 as the next digit of our solution. 
Result so far: 23059.5
Subtracting 2100 from 2100 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:
When dividing 0 by 420, we get 0 with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 23059.5
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.

Advancing to step 10:
0 divided by 420 is 0 with a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 23059.5
If we subtract 0 from 0, we 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.

In conclusion, the division gives 23059.5 with a balance of 0.0.