We're dividing 521309 by 79 
The aim is to understand the frequency of 79 in 521309.

Step 1:
79 can be fit into 5 0 times, resulting in a remainder of 5.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 5 and we're left with 5.
Grab the next digit (2) from the dividend, add it to 5, then carry on: 52 / 79

Step 2:
When dividing 52 by 79, we get 0 with a remainder of 52.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 52, we get 52.
Append the next digit (1) from the dividend to 52 and continue with: 521 / 79

Step 3:
When dividing 521 by 79, we get 6 with a remainder of 47.
The next digit of our result is 6. 
Result so far: 6.0
Subtract 474 from 521 to get 47.
Fetch the next digit (3) from the dividend, attach it to 47 and continue: 473 / 79

Going ahead to step 4:
If we divide 473 by 79, we get 5 and a remainder of 78.
Use 5 as the next digit of our solution. 
Result so far: 65.0
If we subtract 395 from 473, we get 78.
Take the next digit (0) from the dividend and append it to 78, then repeat: 780 / 79

Going ahead to step 5:
When dividing 780 by 79, we get 9 with a remainder of 69.
Use 9 as the next digit of our solution. 
Result so far: 659.0
The remainder is 69 after subtracting 711 from 780.
Grab the next digit (9) from the dividend, add it to 69, then carry on: 699 / 79

Step 6:
79 can be fit into 699 8 times, resulting in a remainder of 67.
The next digit of our result is 8. 
Result so far: 6598.0
Deduct 632 from 699 and we're left with 67.
Since there are no more digits in the dividend, we add a zero to the remainder making it 670, and continue the process.

Let's proceed to step 7:
If we divide 670 by 79, we get 8 and a remainder of 38.
Put 8 as the next digit of the answer. 
Result so far: 6598.8
Subtracting 632 from 670 leaves us with 38.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

On to step 8:
79 can be fit into 380 4 times, resulting in a remainder of 64.
Use 4 as the next digit of our solution. 
Result so far: 6598.84
If we take 316 away from 380, we end up with 64.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

Step 9:
The number 79 fits into 640 8 times, leaving a remainder of 8.
The next digit of our result is 8. 
Result so far: 6598.848
Deduct 632 from 640 and we're left with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Going ahead to step 10:
If we divide 80 by 79, we get 1 and a remainder of 1.
Use 1 as the next digit of our solution. 
Result so far: 6598.8481
Deduct 79 from 80 and we're left with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Moving on to step 11:
79 goes into 10 0 times with a remainder of 10.
Record the quotient 0 as the next digit in the result. 
Result so far: 6598.8481
The remainder is 10 after subtracting 0 from 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Step 12:
79 goes into 100 1 times with a remainder of 21.
The next digit of our result is 1. 
Result so far: 6598.848101
The remainder is 21 after subtracting 79 from 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

Let's proceed to step 13:
79 can be fit into 210 2 times, resulting in a remainder of 52.
The number 2 becomes the next digit in our result. 
Result so far: 6598.8481012
Subtracting 158 from 210 leaves us with 52.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

On to step 14:
79 goes into 520 6 times with a remainder of 46.
The number 6 becomes the next digit in our result. 
Result so far: 6598.84810126
Subtract 474 from 520 to get 46.
Since there are no more digits in the dividend, we add a zero to the remainder making it 460, and continue the process.

The final outcome is 6598.84810126, with a leftover of 4.6e-08.