53999662 ÷ 420 
The aim is to understand the frequency of 420 in 53999662.

On to step 1:
If we divide 5 by 420, we get 0 and a remainder of 5.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 5 leaves us with 5.
Bring next digit (3) of the dividend behind the 5 and repeat the process: 53 / 420

Let's proceed to step 2:
When dividing 53 by 420, we get 0 with a remainder of 53.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 53 and we're left with 53.
Fetch the next digit (9) from the dividend, attach it to 53 and continue: 539 / 420

Let's proceed to step 3:
When dividing 539 by 420, we get 1 with a remainder of 119.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
The remainder is 119 after subtracting 420 from 539.
Bring next digit (9) of the dividend behind the 119 and repeat the process: 1199 / 420

Advancing to step 4:
420 goes into 1199 2 times with a remainder of 359.
Put 2 as the next digit of the answer. 
Result so far: 12.0
If we take 840 away from 1199, we end up with 359.
Append the next digit (9) from the dividend to 359 and continue with: 3599 / 420

Going ahead to step 5:
3599 divided by 420 is 8 with a remainder of 239.
Put 8 as the next digit of the answer. 
Result so far: 128.0
Subtracting 3360 from 3599 leaves us with 239.
Append the next digit (6) from the dividend to 239 and continue with: 2396 / 420

Moving on to step 6:
If we divide 2396 by 420, we get 5 and a remainder of 296.
Use 5 as the next digit of our solution. 
Result so far: 1285.0
If we take 2100 away from 2396, we end up with 296.
Include the next digit (6) from the dividend after 296, then repeat: 2966 / 420

Moving on to step 7:
2966 divided by 420 is 7 with a remainder of 26.
The next digit of our result is 7. 
Result so far: 12857.0
The remainder is 26 after subtracting 2940 from 2966.
Fetch the next digit (2) from the dividend, attach it to 26 and continue: 262 / 420

Moving on to step 8:
420 goes into 262 0 times with a remainder of 262.
Use 0 as the next digit of our solution. 
Result so far: 128570.0
Subtract 0 from 262 to get 262.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2620, and continue the process.

Step 9:
The number 420 fits into 2620 6 times, leaving a remainder of 100.
The number 6 becomes the next digit in our result. 
Result so far: 128570.6
Subtract 2520 from 2620 to get 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 10:
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: 128570.62
Subtracting 840 from 1000 leaves us with 160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1600, and continue the process.

On to step 11:
If we divide 1600 by 420, we get 3 and a remainder of 340.
Write down 3 as next digit of the result. 
Result so far: 128570.623
Deduct 1260 from 1600 and we're left 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.

Let's proceed to step 12:
3400 divided by 420 is 8 with a remainder of 40.
Write down 8 as next digit of the result. 
Result so far: 128570.6238
If we take 3360 away from 3400, we end up 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.

On to step 13:
The number 420 fits into 400 0 times, leaving a remainder of 400.
The next digit of our result is 0. 
Result so far: 128570.6238
Subtract 0 from 400 to 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 14:
4000 divided by 420 is 9 with a remainder of 220.
Put 9 as the next digit of the answer. 
Result so far: 128570.623809
If we take 3780 away from 4000, we end up with 220.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2200, and continue the process.

Going ahead to step 15:
420 goes into 2200 5 times with a remainder of 100.
Put 5 as the next digit of the answer. 
Result so far: 128570.6238095
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 16:
When dividing 1000 by 420, we get 2 with a remainder of 160.
Write down 2 as next digit of the result. 
Result so far: 128570.62380952
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.

In conclusion, the division gives 128570.62380952 with a balance of 1.6e-07.