We're dividing 52739202 by 421 
The aim is to understand the frequency of 421 in 52739202.

Going ahead to step 1:
If we divide 5 by 421, we get 0 and a remainder of 5.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 5 and we're left with 5.
Bring next digit (2) of the dividend behind the 5 and repeat the process: 52 / 421

Moving on to step 2:
When dividing 52 by 421, we get 0 with a remainder of 52.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 52, we get 52.
Include the next digit (7) from the dividend after 52, then repeat: 527 / 421

Step 3:
The number 421 fits into 527 1 times, leaving a remainder of 106.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
The remainder is 106 after subtracting 421 from 527.
Take the next digit (3) from the dividend and append it to 106, then repeat: 1063 / 421

Step 4:
421 can be fit into 1063 2 times, resulting in a remainder of 221.
Put 2 as the next digit of the answer. 
Result so far: 12.0
Subtracting 842 from 1063 leaves us with 221.
Include the next digit (9) from the dividend after 221, then repeat: 2219 / 421

Let's proceed to step 5:
2219 divided by 421 is 5 with a remainder of 114.
The number 5 becomes the next digit in our result. 
Result so far: 125.0
If we subtract 2105 from 2219, we get 114.
Grab the next digit (2) from the dividend, add it to 114, then carry on: 1142 / 421

Let's proceed to step 6:
421 can be fit into 1142 2 times, resulting in a remainder of 300.
Use 2 as the next digit of our solution. 
Result so far: 1252.0
Deduct 842 from 1142 and we're left with 300.
Bring next digit (0) of the dividend behind the 300 and repeat the process: 3000 / 421

Advancing to step 7:
When dividing 3000 by 421, we get 7 with a remainder of 53.
Use 7 as the next digit of our solution. 
Result so far: 12527.0
Subtracting 2947 from 3000 leaves us with 53.
Take the next digit (2) from the dividend and append it to 53, then repeat: 532 / 421

Moving on to step 8:
If we divide 532 by 421, we get 1 and a remainder of 111.
Write down 1 as next digit of the result. 
Result so far: 125271.0
Deduct 421 from 532 and we're left with 111.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1110, and continue the process.

Let's proceed to step 9:
If we divide 1110 by 421, we get 2 and a remainder of 268.
The next digit of our result is 2. 
Result so far: 125271.2
Deduct 842 from 1110 and we're left with 268.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2680, and continue the process.

Going ahead to step 10:
2680 divided by 421 is 6 with a remainder of 154.
The number 6 becomes the next digit in our result. 
Result so far: 125271.26
Subtract 2526 from 2680 to get 154.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1540, and continue the process.

Let's proceed to step 11:
421 can be fit into 1540 3 times, resulting in a remainder of 277.
Use 3 as the next digit of our solution. 
Result so far: 125271.263
If we take 1263 away from 1540, we end up with 277.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2770, and continue the process.

Going ahead to step 12:
When dividing 2770 by 421, we get 6 with a remainder of 244.
The next digit of our result is 6. 
Result so far: 125271.2636
The remainder is 244 after subtracting 2526 from 2770.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2440, and continue the process.

Going ahead to step 13:
2440 divided by 421 is 5 with a remainder of 335.
The next digit of our result is 5. 
Result so far: 125271.26365
Subtract 2105 from 2440 to get 335.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3350, and continue the process.

On to step 14:
The number 421 fits into 3350 7 times, leaving a remainder of 403.
Write down 7 as next digit of the result. 
Result so far: 125271.263657
Deduct 2947 from 3350 and we're left with 403.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4030, and continue the process.

Moving on to step 15:
The number 421 fits into 4030 9 times, leaving a remainder of 241.
Write down 9 as next digit of the result. 
Result so far: 125271.2636579
The remainder is 241 after subtracting 3789 from 4030.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2410, and continue the process.

Advancing to step 16:
If we divide 2410 by 421, we get 5 and a remainder of 305.
Write down 5 as next digit of the result. 
Result so far: 125271.26365795
The remainder is 305 after subtracting 2105 from 2410.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3050, and continue the process.

Our division results in 125271.26365795 with a remaining 3.05e-07.