5792512 divided by 420 
The aim is to understand the frequency of 420 in 5792512.

On to step 1:
5 divided by 420 is 0 with a remainder of 5.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 5 after subtracting 0 from 5.
Include the next digit (7) from the dividend after 5, then repeat: 57 / 420

Advancing to step 2:
When dividing 57 by 420, we get 0 with a remainder of 57.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 57, we get 57.
Fetch the next digit (9) from the dividend, attach it to 57 and continue: 579 / 420

On to step 3:
The number 420 fits into 579 1 times, leaving a remainder of 159.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Deduct 420 from 579 and we're left with 159.
Bring next digit (2) of the dividend behind the 159 and repeat the process: 1592 / 420

Moving on to step 4:
420 goes into 1592 3 times with a remainder of 332.
The number 3 becomes the next digit in our result. 
Result so far: 13.0
Subtract 1260 from 1592 to get 332.
Grab the next digit (5) from the dividend, add it to 332, then carry on: 3325 / 420

Advancing to step 5:
The number 420 fits into 3325 7 times, leaving a remainder of 385.
The next digit of our result is 7. 
Result so far: 137.0
Subtract 2940 from 3325 to get 385.
Grab the next digit (1) from the dividend, add it to 385, then carry on: 3851 / 420

Moving on to step 6:
3851 divided by 420 is 9 with a remainder of 71.
The next digit of our result is 9. 
Result so far: 1379.0
Subtracting 3780 from 3851 leaves us with 71.
Fetch the next digit (2) from the dividend, attach it to 71 and continue: 712 / 420

Step 7:
712 divided by 420 is 1 with a remainder of 292.
Use 1 as the next digit of our solution. 
Result so far: 13791.0
The remainder is 292 after subtracting 420 from 712.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2920, and continue the process.

Step 8:
2920 divided by 420 is 6 with a remainder of 400.
Record the quotient 6 as the next digit in the result. 
Result so far: 13791.6
The remainder is 400 after subtracting 2520 from 2920.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4000, and continue the process.

Step 9:
4000 divided by 420 is 9 with a remainder of 220.
The number 9 becomes the next digit in our result. 
Result so far: 13791.69
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.

Moving on to step 10:
420 can be fit into 2200 5 times, resulting in a remainder of 100.
Write down 5 as next digit of the result. 
Result so far: 13791.695
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 11:
If we divide 1000 by 420, we get 2 and a remainder of 160.
Put 2 as the next digit of the answer. 
Result so far: 13791.6952
The remainder is 160 after subtracting 840 from 1000.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1600, and continue the process.

Let's proceed to step 12:
The number 420 fits into 1600 3 times, leaving a remainder of 340.
Write down 3 as next digit of the result. 
Result so far: 13791.69523
Subtracting 1260 from 1600 leaves us 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.

Step 13:
When dividing 3400 by 420, we get 8 with a remainder of 40.
Use 8 as the next digit of our solution. 
Result so far: 13791.695238
The remainder is 40 after subtracting 3360 from 3400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Advancing to step 14:
When dividing 400 by 420, we get 0 with a remainder of 400.
Write down 0 as next digit of the result. 
Result so far: 13791.695238
The remainder is 400 after subtracting 0 from 400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4000, and continue the process.

On to step 15:
420 goes into 4000 9 times with a remainder of 220.
Put 9 as the next digit of the answer. 
Result so far: 13791.69523809
Deduct 3780 from 4000 and we're left 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.

Our division results in 13791.69523809 with a remaining 2.2e-07.