We look at the division of 369966 by 7 
The aim is to understand the frequency of 7 in 369966.

Let's proceed to step 1:
The number 7 fits into 3 0 times, leaving a remainder of 3.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 3 and we're left with 3.
Bring next digit (6) of the dividend behind the 3 and repeat the process: 36 / 7

Advancing to step 2:
When dividing 36 by 7, we get 5 with a remainder of 1.
Write down 5 as next digit of the result. 
Result so far: 5.0
Deduct 35 from 36 and we're left with 1.
Append the next digit (9) from the dividend to 1 and continue with: 19 / 7

On to step 3:
7 goes into 19 2 times with a remainder of 5.
Write down 2 as next digit of the result. 
Result so far: 52.0
If we subtract 14 from 19, we get 5.
Grab the next digit (9) from the dividend, add it to 5, then carry on: 59 / 7

Moving on to step 4:
The number 7 fits into 59 8 times, leaving a remainder of 3.
Record the quotient 8 as the next digit in the result. 
Result so far: 528.0
Subtract 56 from 59 to get 3.
Grab the next digit (6) from the dividend, add it to 3, then carry on: 36 / 7

Going ahead to step 5:
7 goes into 36 5 times with a remainder of 1.
The next digit of our result is 5. 
Result so far: 5285.0
If we take 35 away from 36, we end up with 1.
Take the next digit (6) from the dividend and append it to 1, then repeat: 16 / 7

Going ahead to step 6:
The number 7 fits into 16 2 times, leaving a remainder of 2.
The number 2 becomes the next digit in our result. 
Result so far: 52852.0
The remainder is 2 after subtracting 14 from 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Going ahead to step 7:
20 divided by 7 is 2 with a remainder of 6.
Record the quotient 2 as the next digit in the result. 
Result so far: 52852.2
If we subtract 14 from 20, we 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 8:
The number 7 fits into 60 8 times, leaving a remainder of 4.
Record the quotient 8 as the next digit in the result. 
Result so far: 52852.28
Deduct 56 from 60 and we're left 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.

On to step 9:
40 divided by 7 is 5 with a remainder of 5.
Use 5 as the next digit of our solution. 
Result so far: 52852.285
The remainder is 5 after subtracting 35 from 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

On to step 10:
When dividing 50 by 7, we get 7 with a remainder of 1.
Write down 7 as next digit of the result. 
Result so far: 52852.2857
Subtract 49 from 50 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.

Step 11:
7 goes into 10 1 times with a remainder of 3.
Record the quotient 1 as the next digit in the result. 
Result so far: 52852.28571
Subtract 7 from 10 to 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.

Let's proceed to step 12:
If we divide 30 by 7, we get 4 and a remainder of 2.
Record the quotient 4 as the next digit in the result. 
Result so far: 52852.285714
Subtract 28 from 30 to get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

On to step 13:
The number 7 fits into 20 2 times, leaving a remainder of 6.
The next digit of our result is 2. 
Result so far: 52852.2857142
If we take 14 away from 20, we end up 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.

Going ahead to step 14:
60 divided by 7 is 8 with a remainder of 4.
Record the quotient 8 as the next digit in the result. 
Result so far: 52852.28571428
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.

In conclusion, the division gives 52852.28571428 with a balance of 4e-09.