We divide 645184 by 7
The aim is to understand the frequency of 7 in 645184.

Advancing to step 1:
The number 7 fits into 6 0 times, leaving a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 6, we get 6.
Grab the next digit (4) from the dividend, add it to 6, then carry on: 64 / 7

Going ahead to step 2:
7 goes into 64 9 times with a remainder of 1.
Write down 9 as next digit of the result. 
Result so far: 9.0
If we take 63 away from 64, we end up with 1.
Append the next digit (5) from the dividend to 1 and continue with: 15 / 7

On to step 3:
7 can be fit into 15 2 times, resulting in a remainder of 1.
Write down 2 as next digit of the result. 
Result so far: 92.0
If we take 14 away from 15, we end up with 1.
Grab the next digit (1) from the dividend, add it to 1, then carry on: 11 / 7

Moving on to step 4:
When dividing 11 by 7, we get 1 with a remainder of 4.
The next digit of our result is 1. 
Result so far: 921.0
Deduct 7 from 11 and we're left with 4.
Take the next digit (8) from the dividend and append it to 4, then repeat: 48 / 7

Let's proceed to step 5:
7 goes into 48 6 times with a remainder of 6.
Put 6 as the next digit of the answer. 
Result so far: 9216.0
Deduct 42 from 48 and we're left with 6.
Append the next digit (4) from the dividend to 6 and continue with: 64 / 7

Advancing to step 6:
If we divide 64 by 7, we get 9 and a remainder of 1.
The next digit of our result is 9. 
Result so far: 92169.0
Subtract 63 from 64 to get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Let's proceed to step 7:
7 can be fit into 10 1 times, resulting in a remainder of 3.
The next digit of our result is 1. 
Result so far: 92169.1
If we subtract 7 from 10, we get 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

On to step 8:
30 divided by 7 is 4 with a remainder of 2.
Use 4 as the next digit of our solution. 
Result so far: 92169.14
If we take 28 away from 30, we end up with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Step 9:
The number 7 fits into 20 2 times, leaving a remainder of 6.
The next digit of our result is 2. 
Result so far: 92169.142
Subtract 14 from 20 to get 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Going ahead to step 10:
60 divided by 7 is 8 with a remainder of 4.
Use 8 as the next digit of our solution. 
Result so far: 92169.1428
Subtracting 56 from 60 leaves us with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Advancing to step 11:
40 divided by 7 is 5 with a remainder of 5.
The number 5 becomes the next digit in our result. 
Result so far: 92169.14285
If we subtract 35 from 40, we get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Advancing to step 12:
If we divide 50 by 7, we get 7 and a remainder of 1.
Put 7 as the next digit of the answer. 
Result so far: 92169.142857
Subtracting 49 from 50 leaves us 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.

Step 13:
The number 7 fits into 10 1 times, leaving a remainder of 3.
Use 1 as the next digit of our solution. 
Result so far: 92169.1428571
Subtracting 7 from 10 leaves us with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

On to step 14:
If we divide 30 by 7, we get 4 and a remainder of 2.
Use 4 as the next digit of our solution. 
Result so far: 92169.14285714
Subtracting 28 from 30 leaves us with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Our division results in 92169.14285714 with a remaining 2e-09.