645838 ÷ 79 
The aim is to understand the frequency of 79 in 645838.

Moving on to step 1:
The number 79 fits into 6 0 times, leaving a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 6 after subtracting 0 from 6.
Grab the next digit (4) from the dividend, add it to 6, then carry on: 64 / 79

On to step 2:
79 can be fit into 64 0 times, resulting in a remainder of 64.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 64, we get 64.
Append the next digit (5) from the dividend to 64 and continue with: 645 / 79

Moving on to step 3:
When dividing 645 by 79, we get 8 with a remainder of 13.
Record the quotient 8 as the next digit in the result. 
Result so far: 8.0
Subtracting 632 from 645 leaves us with 13.
Fetch the next digit (8) from the dividend, attach it to 13 and continue: 138 / 79

Going ahead to step 4:
When dividing 138 by 79, we get 1 with a remainder of 59.
The number 1 becomes the next digit in our result. 
Result so far: 81.0
The remainder is 59 after subtracting 79 from 138.
Include the next digit (3) from the dividend after 59, then repeat: 593 / 79

Let's proceed to step 5:
593 divided by 79 is 7 with a remainder of 40.
Record the quotient 7 as the next digit in the result. 
Result so far: 817.0
Deduct 553 from 593 and we're left with 40.
Grab the next digit (8) from the dividend, add it to 40, then carry on: 408 / 79

Going ahead to step 6:
The number 79 fits into 408 5 times, leaving a remainder of 13.
The number 5 becomes the next digit in our result. 
Result so far: 8175.0
Subtract 395 from 408 to get 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Step 7:
130 divided by 79 is 1 with a remainder of 51.
Use 1 as the next digit of our solution. 
Result so far: 8175.1
Subtract 79 from 130 to get 51.
Since there are no more digits in the dividend, we add a zero to the remainder making it 510, and continue the process.

On to step 8:
510 divided by 79 is 6 with a remainder of 36.
Use 6 as the next digit of our solution. 
Result so far: 8175.16
If we take 474 away from 510, we end up with 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

On to step 9:
If we divide 360 by 79, we get 4 and a remainder of 44.
The number 4 becomes the next digit in our result. 
Result so far: 8175.164
The remainder is 44 after subtracting 316 from 360.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

Step 10:
79 goes into 440 5 times with a remainder of 45.
Put 5 as the next digit of the answer. 
Result so far: 8175.1645
Deduct 395 from 440 and we're left with 45.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

Moving on to step 11:
79 goes into 450 5 times with a remainder of 55.
The number 5 becomes the next digit in our result. 
Result so far: 8175.16455
The remainder is 55 after subtracting 395 from 450.
Since there are no more digits in the dividend, we add a zero to the remainder making it 550, and continue the process.

The final result is 8175.16455 with a remainder of 5.5e-05.