99775220 ÷ 420 
The aim is to understand the frequency of 420 in 99775220.

Going ahead to step 1:
420 goes into 9 0 times with a remainder of 9.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 9 leaves us with 9.
Grab the next digit (9) from the dividend, add it to 9, then carry on: 99 / 420

Moving on to step 2:
420 can be fit into 99 0 times, resulting in a remainder of 99.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 99 to get 99.
Fetch the next digit (7) from the dividend, attach it to 99 and continue: 997 / 420

Let's proceed to step 3:
If we divide 997 by 420, we get 2 and a remainder of 157.
Write down 2 as next digit of the result. 
Result so far: 2.0
Subtract 840 from 997 to get 157.
Bring next digit (7) of the dividend behind the 157 and repeat the process: 1577 / 420

Step 4:
420 can be fit into 1577 3 times, resulting in a remainder of 317.
Use 3 as the next digit of our solution. 
Result so far: 23.0
The remainder is 317 after subtracting 1260 from 1577.
Take the next digit (5) from the dividend and append it to 317, then repeat: 3175 / 420

Let's proceed to step 5:
If we divide 3175 by 420, we get 7 and a remainder of 235.
Put 7 as the next digit of the answer. 
Result so far: 237.0
Subtract 2940 from 3175 to get 235.
Take the next digit (2) from the dividend and append it to 235, then repeat: 2352 / 420

Step 6:
420 can be fit into 2352 5 times, resulting in a remainder of 252.
Use 5 as the next digit of our solution. 
Result so far: 2375.0
The remainder is 252 after subtracting 2100 from 2352.
Include the next digit (2) from the dividend after 252, then repeat: 2522 / 420

Advancing to step 7:
If we divide 2522 by 420, we get 6 and a remainder of 2.
The next digit of our result is 6. 
Result so far: 23756.0
Subtract 2520 from 2522 to get 2.
Take the next digit (0) from the dividend and append it to 2, then repeat: 20 / 420

Let's proceed to step 8:
420 can be fit into 20 0 times, resulting in a remainder of 20.
The next digit of our result is 0. 
Result so far: 237560.0
If we subtract 0 from 20, we get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Going ahead to step 9:
When dividing 200 by 420, we get 0 with a remainder of 200.
Record the quotient 0 as the next digit in the result. 
Result so far: 237560.0
Subtracting 0 from 200 leaves us with 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2000, and continue the process.

Advancing to step 10:
The number 420 fits into 2000 4 times, leaving a remainder of 320.
Record the quotient 4 as the next digit in the result. 
Result so far: 237560.04
Subtracting 1680 from 2000 leaves us with 320.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3200, and continue the process.

Going ahead to step 11:
420 goes into 3200 7 times with a remainder of 260.
Use 7 as the next digit of our solution. 
Result so far: 237560.047
Subtracting 2940 from 3200 leaves us with 260.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2600, and continue the process.

Moving on to step 12:
420 can be fit into 2600 6 times, resulting in a remainder of 80.
The next digit of our result is 6. 
Result so far: 237560.0476
Subtract 2520 from 2600 to get 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

Moving on to step 13:
420 can be fit into 800 1 times, resulting in a remainder of 380.
Put 1 as the next digit of the answer. 
Result so far: 237560.04761
Subtracting 420 from 800 leaves us with 380.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3800, and continue the process.

Going ahead to step 14:
If we divide 3800 by 420, we get 9 and a remainder of 20.
The next digit of our result is 9. 
Result so far: 237560.047619
Subtract 3780 from 3800 to get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Going ahead to step 15:
The number 420 fits into 200 0 times, leaving a remainder of 200.
The number 0 becomes the next digit in our result. 
Result so far: 237560.047619
Subtracting 0 from 200 leaves us with 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2000, and continue the process.

Let's proceed to step 16:
If we divide 2000 by 420, we get 4 and a remainder of 320.
The number 4 becomes the next digit in our result. 
Result so far: 237560.04761904
If we take 1680 away from 2000, we end up with 320.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3200, and continue the process.

In conclusion, the division gives 237560.04761904 with a balance of 3.2e-07.