Let's divide 548623 by 7
The aim is to understand the frequency of 7 in 548623.

Step 1:
5 divided by 7 is 0 with a remainder of 5.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 5 after subtracting 0 from 5.
Grab the next digit (4) from the dividend, add it to 5, then carry on: 54 / 7

On to step 2:
7 goes into 54 7 times with a remainder of 5.
The number 7 becomes the next digit in our result. 
Result so far: 7.0
The remainder is 5 after subtracting 49 from 54.
Bring next digit (8) of the dividend behind the 5 and repeat the process: 58 / 7

Going ahead to step 3:
When dividing 58 by 7, we get 8 with a remainder of 2.
Write down 8 as next digit of the result. 
Result so far: 78.0
If we take 56 away from 58, we end up with 2.
Append the next digit (6) from the dividend to 2 and continue with: 26 / 7

Going ahead to step 4:
When dividing 26 by 7, we get 3 with a remainder of 5.
The number 3 becomes the next digit in our result. 
Result so far: 783.0
If we subtract 21 from 26, we get 5.
Take the next digit (2) from the dividend and append it to 5, then repeat: 52 / 7

Let's proceed to step 5:
7 goes into 52 7 times with a remainder of 3.
The next digit of our result is 7. 
Result so far: 7837.0
If we take 49 away from 52, we end up with 3.
Append the next digit (3) from the dividend to 3 and continue with: 33 / 7

Step 6:
7 can be fit into 33 4 times, resulting in a remainder of 5.
Record the quotient 4 as the next digit in the result. 
Result so far: 78374.0
Subtract 28 from 33 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.

Advancing to step 7:
The number 7 fits into 50 7 times, leaving a remainder of 1.
Record the quotient 7 as the next digit in the result. 
Result so far: 78374.7
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.

Let's proceed to step 8:
The number 7 fits into 10 1 times, leaving a remainder of 3.
Put 1 as the next digit of the answer. 
Result so far: 78374.71
The remainder is 3 after subtracting 7 from 10.
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 9:
30 divided by 7 is 4 with a remainder of 2.
The next digit of our result is 4. 
Result so far: 78374.714
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.

Let's proceed to step 10:
7 can be fit into 20 2 times, resulting in a remainder of 6.
Put 2 as the next digit of the answer. 
Result so far: 78374.7142
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.

Let's proceed to step 11:
60 divided by 7 is 8 with a remainder of 4.
Put 8 as the next digit of the answer. 
Result so far: 78374.71428
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.

Moving on to step 12:
40 divided by 7 is 5 with a remainder of 5.
Use 5 as the next digit of our solution. 
Result so far: 78374.714285
Deduct 35 from 40 and we're left with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Moving on to step 13:
When dividing 50 by 7, we get 7 with a remainder of 1.
Put 7 as the next digit of the answer. 
Result so far: 78374.7142857
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 14:
10 divided by 7 is 1 with a remainder of 3.
The next digit of our result is 1. 
Result so far: 78374.71428571
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.

After the division, we end up with 78374.71428571 and a remainder of 3e-09.