We look at the division of 33486213 by 420 
The aim is to understand the frequency of 420 in 33486213.

Moving on to step 1:
The number 420 fits into 3 0 times, leaving a remainder of 3.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 3, we get 3.
Bring next digit (3) of the dividend behind the 3 and repeat the process: 33 / 420

Advancing to step 2:
420 can be fit into 33 0 times, resulting in a remainder of 33.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 33, we get 33.
Fetch the next digit (4) from the dividend, attach it to 33 and continue: 334 / 420

Let's proceed to step 3:
When dividing 334 by 420, we get 0 with a remainder of 334.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 334 leaves us with 334.
Take the next digit (8) from the dividend and append it to 334, then repeat: 3348 / 420

On to step 4:
If we divide 3348 by 420, we get 7 and a remainder of 408.
Put 7 as the next digit of the answer. 
Result so far: 7.0
If we subtract 2940 from 3348, we get 408.
Take the next digit (6) from the dividend and append it to 408, then repeat: 4086 / 420

Going ahead to step 5:
The number 420 fits into 4086 9 times, leaving a remainder of 306.
Put 9 as the next digit of the answer. 
Result so far: 79.0
Subtracting 3780 from 4086 leaves us with 306.
Grab the next digit (2) from the dividend, add it to 306, then carry on: 3062 / 420

Moving on to step 6:
3062 divided by 420 is 7 with a remainder of 122.
Put 7 as the next digit of the answer. 
Result so far: 797.0
The remainder is 122 after subtracting 2940 from 3062.
Grab the next digit (1) from the dividend, add it to 122, then carry on: 1221 / 420

Advancing to step 7:
When dividing 1221 by 420, we get 2 with a remainder of 381.
Use 2 as the next digit of our solution. 
Result so far: 7972.0
The remainder is 381 after subtracting 840 from 1221.
Take the next digit (3) from the dividend and append it to 381, then repeat: 3813 / 420

On to step 8:
The number 420 fits into 3813 9 times, leaving a remainder of 33.
The next digit of our result is 9. 
Result so far: 79729.0
The remainder is 33 after subtracting 3780 from 3813.
Since there are no more digits in the dividend, we add a zero to the remainder making it 330, and continue the process.

Moving on to step 9:
330 divided by 420 is 0 with a remainder of 330.
Put 0 as the next digit of the answer. 
Result so far: 79729.0
If we take 0 away from 330, we end up with 330.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3300, and continue the process.

Advancing to step 10:
420 can be fit into 3300 7 times, resulting in a remainder of 360.
The next digit of our result is 7. 
Result so far: 79729.07
If we subtract 2940 from 3300, we get 360.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3600, and continue the process.

Step 11:
When dividing 3600 by 420, we get 8 with a remainder of 240.
Put 8 as the next digit of the answer. 
Result so far: 79729.078
The remainder is 240 after subtracting 3360 from 3600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2400, and continue the process.

Let's proceed to step 12:
420 goes into 2400 5 times with a remainder of 300.
The next digit of our result is 5. 
Result so far: 79729.0785
Deduct 2100 from 2400 and we're left with 300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3000, and continue the process.

Let's proceed to step 13:
The number 420 fits into 3000 7 times, leaving a remainder of 60.
The next digit of our result is 7. 
Result so far: 79729.07857
If we subtract 2940 from 3000, we get 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Step 14:
If we divide 600 by 420, we get 1 and a remainder of 180.
Use 1 as the next digit of our solution. 
Result so far: 79729.078571
Subtracting 420 from 600 leaves us with 180.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1800, and continue the process.

Let's proceed to step 15:
420 can be fit into 1800 4 times, resulting in a remainder of 120.
The next digit of our result is 4. 
Result so far: 79729.0785714
If we subtract 1680 from 1800, we get 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1200, and continue the process.

Advancing to step 16:
The number 420 fits into 1200 2 times, leaving a remainder of 360.
The next digit of our result is 2. 
Result so far: 79729.07857142
If we subtract 840 from 1200, we get 360.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3600, and continue the process.

The final outcome is 79729.07857142, with a leftover of 3.6e-07.