We look at the division of 420515 by 79 
The aim is to understand the frequency of 79 in 420515.

On to step 1:
The number 79 fits into 4 0 times, leaving a remainder of 4.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 4, we end up with 4.
Bring next digit (2) of the dividend behind the 4 and repeat the process: 42 / 79

On to step 2:
When dividing 42 by 79, we get 0 with a remainder of 42.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 42 and we're left with 42.
Bring next digit (0) of the dividend behind the 42 and repeat the process: 420 / 79

Advancing to step 3:
If we divide 420 by 79, we get 5 and a remainder of 25.
Use 5 as the next digit of our solution. 
Result so far: 5.0
Deduct 395 from 420 and we're left with 25.
Include the next digit (5) from the dividend after 25, then repeat: 255 / 79

Advancing to step 4:
255 divided by 79 is 3 with a remainder of 18.
Record the quotient 3 as the next digit in the result. 
Result so far: 53.0
If we subtract 237 from 255, we get 18.
Include the next digit (1) from the dividend after 18, then repeat: 181 / 79

Moving on to step 5:
When dividing 181 by 79, we get 2 with a remainder of 23.
Write down 2 as next digit of the result. 
Result so far: 532.0
Subtract 158 from 181 to get 23.
Fetch the next digit (5) from the dividend, attach it to 23 and continue: 235 / 79

Going ahead to step 6:
235 divided by 79 is 2 with a remainder of 77.
Write down 2 as next digit of the result. 
Result so far: 5322.0
The remainder is 77 after subtracting 158 from 235.
Since there are no more digits in the dividend, we add a zero to the remainder making it 770, and continue the process.

Let's proceed to step 7:
When dividing 770 by 79, we get 9 with a remainder of 59.
Write down 9 as next digit of the result. 
Result so far: 5322.9
The remainder is 59 after subtracting 711 from 770.
Since there are no more digits in the dividend, we add a zero to the remainder making it 590, and continue the process.

Moving on to step 8:
If we divide 590 by 79, we get 7 and a remainder of 37.
Put 7 as the next digit of the answer. 
Result so far: 5322.97
If we take 553 away from 590, we end up with 37.
Since there are no more digits in the dividend, we add a zero to the remainder making it 370, and continue the process.

Going ahead to step 9:
The number 79 fits into 370 4 times, leaving a remainder of 54.
The next digit of our result is 4. 
Result so far: 5322.974
If we take 316 away from 370, we end up with 54.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

Going ahead to step 10:
79 goes into 540 6 times with a remainder of 66.
Write down 6 as next digit of the result. 
Result so far: 5322.9746
Subtracting 474 from 540 leaves us with 66.
Since there are no more digits in the dividend, we add a zero to the remainder making it 660, and continue the process.

Advancing to step 11:
79 can be fit into 660 8 times, resulting in a remainder of 28.
Use 8 as the next digit of our solution. 
Result so far: 5322.97468
Subtract 632 from 660 to get 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Advancing to step 12:
When dividing 280 by 79, we get 3 with a remainder of 43.
The next digit of our result is 3. 
Result so far: 5322.974683
The remainder is 43 after subtracting 237 from 280.
Since there are no more digits in the dividend, we add a zero to the remainder making it 430, and continue the process.

Advancing to step 13:
79 goes into 430 5 times with a remainder of 35.
Use 5 as the next digit of our solution. 
Result so far: 5322.9746835
Deduct 395 from 430 and we're left with 35.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

Advancing to step 14:
When dividing 350 by 79, we get 4 with a remainder of 34.
Write down 4 as next digit of the result. 
Result so far: 5322.97468354
Deduct 316 from 350 and we're left with 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

The quotient of the division is 5322.97468354, and the remainder is 3.4e-08.