34017347 divided by 420 
The aim is to understand the frequency of 420 in 34017347.

On to step 1:
If we divide 3 by 420, we get 0 and a remainder of 3.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 3 and we're left with 3.
Append the next digit (4) from the dividend to 3 and continue with: 34 / 420

Step 2:
420 goes into 34 0 times with a remainder of 34.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 34 leaves us with 34.
Bring next digit (0) of the dividend behind the 34 and repeat the process: 340 / 420

Advancing to step 3:
420 goes into 340 0 times with a remainder of 340.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 340 to get 340.
Grab the next digit (1) from the dividend, add it to 340, then carry on: 3401 / 420

Advancing to step 4:
The number 420 fits into 3401 8 times, leaving a remainder of 41.
The number 8 becomes the next digit in our result. 
Result so far: 8.0
The remainder is 41 after subtracting 3360 from 3401.
Fetch the next digit (7) from the dividend, attach it to 41 and continue: 417 / 420

On to step 5:
If we divide 417 by 420, we get 0 and a remainder of 417.
The number 0 becomes the next digit in our result. 
Result so far: 80.0
The remainder is 417 after subtracting 0 from 417.
Grab the next digit (3) from the dividend, add it to 417, then carry on: 4173 / 420

Advancing to step 6:
4173 divided by 420 is 9 with a remainder of 393.
The number 9 becomes the next digit in our result. 
Result so far: 809.0
Subtract 3780 from 4173 to get 393.
Fetch the next digit (4) from the dividend, attach it to 393 and continue: 3934 / 420

Advancing to step 7:
420 can be fit into 3934 9 times, resulting in a remainder of 154.
The next digit of our result is 9. 
Result so far: 8099.0
The remainder is 154 after subtracting 3780 from 3934.
Grab the next digit (7) from the dividend, add it to 154, then carry on: 1547 / 420

Advancing to step 8:
420 can be fit into 1547 3 times, resulting in a remainder of 287.
The number 3 becomes the next digit in our result. 
Result so far: 80993.0
Subtract 1260 from 1547 to get 287.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2870, and continue the process.

Step 9:
When dividing 2870 by 420, we get 6 with a remainder of 350.
Put 6 as the next digit of the answer. 
Result so far: 80993.6
Subtract 2520 from 2870 to get 350.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3500, and continue the process.

Moving on to step 10:
3500 divided by 420 is 8 with a remainder of 140.
The number 8 becomes the next digit in our result. 
Result so far: 80993.68
Subtract 3360 from 3500 to get 140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1400, and continue the process.

Advancing to step 11:
420 goes into 1400 3 times with a remainder of 140.
Put 3 as the next digit of the answer. 
Result so far: 80993.683
Subtract 1260 from 1400 to get 140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1400, and continue the process.

Going ahead to step 12:
420 can be fit into 1400 3 times, resulting in a remainder of 140.
The number 3 becomes the next digit in our result. 
Result so far: 80993.6833
Subtract 1260 from 1400 to get 140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1400, and continue the process.

The final result is 80993.6833 with a remainder of 0.0014.