We're dividing 79031864 by 646 
The aim is to understand the frequency of 646 in 79031864.

Step 1:
The number 646 fits into 7 0 times, leaving a remainder of 7.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 7, we end up with 7.
Bring next digit (9) of the dividend behind the 7 and repeat the process: 79 / 646

On to step 2:
If we divide 79 by 646, we get 0 and a remainder of 79.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 79, we end up with 79.
Include the next digit (0) from the dividend after 79, then repeat: 790 / 646

Step 3:
646 can be fit into 790 1 times, resulting in a remainder of 144.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Subtracting 646 from 790 leaves us with 144.
Fetch the next digit (3) from the dividend, attach it to 144 and continue: 1443 / 646

Moving on to step 4:
If we divide 1443 by 646, we get 2 and a remainder of 151.
Write down 2 as next digit of the result. 
Result so far: 12.0
Deduct 1292 from 1443 and we're left with 151.
Take the next digit (1) from the dividend and append it to 151, then repeat: 1511 / 646

On to step 5:
If we divide 1511 by 646, we get 2 and a remainder of 219.
Use 2 as the next digit of our solution. 
Result so far: 122.0
Subtracting 1292 from 1511 leaves us with 219.
Bring next digit (8) of the dividend behind the 219 and repeat the process: 2198 / 646

Going ahead to step 6:
2198 divided by 646 is 3 with a remainder of 260.
Write down 3 as next digit of the result. 
Result so far: 1223.0
Deduct 1938 from 2198 and we're left with 260.
Grab the next digit (6) from the dividend, add it to 260, then carry on: 2606 / 646

Going ahead to step 7:
2606 divided by 646 is 4 with a remainder of 22.
The next digit of our result is 4. 
Result so far: 12234.0
Deduct 2584 from 2606 and we're left with 22.
Include the next digit (4) from the dividend after 22, then repeat: 224 / 646

Let's proceed to step 8:
When dividing 224 by 646, we get 0 with a remainder of 224.
Record the quotient 0 as the next digit in the result. 
Result so far: 122340.0
Deduct 0 from 224 and we're left with 224.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2240, and continue the process.

Advancing to step 9:
646 can be fit into 2240 3 times, resulting in a remainder of 302.
Record the quotient 3 as the next digit in the result. 
Result so far: 122340.3
Deduct 1938 from 2240 and we're left with 302.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3020, and continue the process.

On to step 10:
646 goes into 3020 4 times with a remainder of 436.
The number 4 becomes the next digit in our result. 
Result so far: 122340.34
The remainder is 436 after subtracting 2584 from 3020.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4360, and continue the process.

Going ahead to step 11:
The number 646 fits into 4360 6 times, leaving a remainder of 484.
The number 6 becomes the next digit in our result. 
Result so far: 122340.346
The remainder is 484 after subtracting 3876 from 4360.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4840, and continue the process.

Step 12:
If we divide 4840 by 646, we get 7 and a remainder of 318.
Use 7 as the next digit of our solution. 
Result so far: 122340.3467
Deduct 4522 from 4840 and we're left with 318.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3180, and continue the process.

Let's proceed to step 13:
646 goes into 3180 4 times with a remainder of 596.
Write down 4 as next digit of the result. 
Result so far: 122340.34674
If we take 2584 away from 3180, we end up with 596.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5960, and continue the process.

Going ahead to step 14:
5960 divided by 646 is 9 with a remainder of 146.
Record the quotient 9 as the next digit in the result. 
Result so far: 122340.346749
If we take 5814 away from 5960, we end up with 146.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1460, and continue the process.

Advancing to step 15:
When dividing 1460 by 646, we get 2 with a remainder of 168.
The next digit of our result is 2. 
Result so far: 122340.3467492
Subtracting 1292 from 1460 leaves us with 168.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1680, and continue the process.

On to step 16:
When dividing 1680 by 646, we get 2 with a remainder of 388.
Record the quotient 2 as the next digit in the result. 
Result so far: 122340.34674922
If we take 1292 away from 1680, we end up with 388.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3880, and continue the process.

The final outcome is 122340.34674922, with a leftover of 3.88e-07.