We look at the division of 456921 by 7 
The aim is to understand the frequency of 7 in 456921.

Going ahead to step 1:
The number 7 fits into 4 0 times, leaving a remainder of 4.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 4 to get 4.
Append the next digit (5) from the dividend to 4 and continue with: 45 / 7

Step 2:
7 can be fit into 45 6 times, resulting in a remainder of 3.
The number 6 becomes the next digit in our result. 
Result so far: 6.0
If we take 42 away from 45, we end up with 3.
Bring next digit (6) of the dividend behind the 3 and repeat the process: 36 / 7

Moving on to step 3:
7 can be fit into 36 5 times, resulting in a remainder of 1.
Write down 5 as next digit of the result. 
Result so far: 65.0
Subtracting 35 from 36 leaves us with 1.
Include the next digit (9) from the dividend after 1, then repeat: 19 / 7

On to step 4:
The number 7 fits into 19 2 times, leaving a remainder of 5.
The number 2 becomes the next digit in our result. 
Result so far: 652.0
Deduct 14 from 19 and we're left with 5.
Take the next digit (2) from the dividend and append it to 5, then repeat: 52 / 7

Advancing to step 5:
7 can be fit into 52 7 times, resulting in a remainder of 3.
Use 7 as the next digit of our solution. 
Result so far: 6527.0
The remainder is 3 after subtracting 49 from 52.
Fetch the next digit (1) from the dividend, attach it to 3 and continue: 31 / 7

Step 6:
7 goes into 31 4 times with a remainder of 3.
Record the quotient 4 as the next digit in the result. 
Result so far: 65274.0
Subtracting 28 from 31 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 7:
7 goes into 30 4 times with a remainder of 2.
Record the quotient 4 as the next digit in the result. 
Result so far: 65274.4
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.

Let's proceed to step 8:
20 divided by 7 is 2 with a remainder of 6.
The number 2 becomes the next digit in our result. 
Result so far: 65274.42
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.

Step 9:
If we divide 60 by 7, we get 8 and a remainder of 4.
Use 8 as the next digit of our solution. 
Result so far: 65274.428
If we take 56 away from 60, we end up 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 10:
7 can be fit into 40 5 times, resulting in a remainder of 5.
Write down 5 as next digit of the result. 
Result so far: 65274.4285
Subtract 35 from 40 to 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.

Let's proceed to step 11:
If we divide 50 by 7, we get 7 and a remainder of 1.
Write down 7 as next digit of the result. 
Result so far: 65274.42857
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.

Going ahead to step 12:
When dividing 10 by 7, we get 1 with a remainder of 3.
The number 1 becomes the next digit in our result. 
Result so far: 65274.428571
Deduct 7 from 10 and we're left 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.

Step 13:
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: 65274.4285714
If we subtract 28 from 30, we 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.

Advancing to step 14:
20 divided by 7 is 2 with a remainder of 6.
The number 2 becomes the next digit in our result. 
Result so far: 65274.42857142
The remainder is 6 after subtracting 14 from 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

After the division, we end up with 65274.42857142 and a remainder of 6e-09.