909645 divided by 7 
The aim is to understand the frequency of 7 in 909645.

Let's proceed to step 1:
When dividing 9 by 7, we get 1 with a remainder of 2.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Deduct 7 from 9 and we're left with 2.
Bring next digit (0) of the dividend behind the 2 and repeat the process: 20 / 7

Going ahead to step 2:
When dividing 20 by 7, we get 2 with a remainder of 6.
The next digit of our result is 2. 
Result so far: 12.0
Deduct 14 from 20 and we're left with 6.
Fetch the next digit (9) from the dividend, attach it to 6 and continue: 69 / 7

Advancing to step 3:
If we divide 69 by 7, we get 9 and a remainder of 6.
Use 9 as the next digit of our solution. 
Result so far: 129.0
If we take 63 away from 69, we end up with 6.
Include the next digit (6) from the dividend after 6, then repeat: 66 / 7

Moving on to step 4:
7 goes into 66 9 times with a remainder of 3.
Use 9 as the next digit of our solution. 
Result so far: 1299.0
If we subtract 63 from 66, we get 3.
Take the next digit (4) from the dividend and append it to 3, then repeat: 34 / 7

Moving on to step 5:
When dividing 34 by 7, we get 4 with a remainder of 6.
The number 4 becomes the next digit in our result. 
Result so far: 12994.0
Subtracting 28 from 34 leaves us with 6.
Append the next digit (5) from the dividend to 6 and continue with: 65 / 7

Step 6:
If we divide 65 by 7, we get 9 and a remainder of 2.
Use 9 as the next digit of our solution. 
Result so far: 129949.0
Deduct 63 from 65 and we're left 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.

Moving on to step 7:
7 goes into 20 2 times with a remainder of 6.
The number 2 becomes the next digit in our result. 
Result so far: 129949.2
Deduct 14 from 20 and we're left with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Let's proceed to step 8:
7 can be fit into 60 8 times, resulting in a remainder of 4.
Write down 8 as next digit of the result. 
Result so far: 129949.28
Subtract 56 from 60 to get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

On to step 9:
The number 7 fits into 40 5 times, leaving a remainder of 5.
Record the quotient 5 as the next digit in the result. 
Result so far: 129949.285
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 10:
50 divided by 7 is 7 with a remainder of 1.
Write down 7 as next digit of the result. 
Result so far: 129949.2857
If we take 49 away from 50, we end up 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.

Going ahead to step 11:
10 divided by 7 is 1 with a remainder of 3.
The next digit of our result is 1. 
Result so far: 129949.28571
If we take 7 away from 10, we end up 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.

Moving on to step 12:
7 can be fit into 30 4 times, resulting in a remainder of 2.
Record the quotient 4 as the next digit in the result. 
Result so far: 129949.285714
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.

Advancing to step 13:
When dividing 20 by 7, we get 2 with a remainder of 6.
The next digit of our result is 2. 
Result so far: 129949.2857142
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.

On to step 14:
7 goes into 60 8 times with a remainder of 4.
Use 8 as the next digit of our solution. 
Result so far: 129949.28571428
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.

The final result is 129949.28571428 with a remainder of 4e-09.