Let's divide 527421 by 7
The aim is to understand the frequency of 7 in 527421.

Step 1:
5 divided by 7 is 0 with a remainder of 5.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 5 after subtracting 0 from 5.
Grab the next digit (2) from the dividend, add it to 5, then carry on: 52 / 7

Moving on to step 2:
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: 7.0
If we take 49 away from 52, we end up with 3.
Fetch the next digit (7) from the dividend, attach it to 3 and continue: 37 / 7

Let's proceed to step 3:
7 goes into 37 5 times with a remainder of 2.
Record the quotient 5 as the next digit in the result. 
Result so far: 75.0
If we take 35 away from 37, we end up with 2.
Bring next digit (4) of the dividend behind the 2 and repeat the process: 24 / 7

Let's proceed to step 4:
7 can be fit into 24 3 times, resulting in a remainder of 3.
Record the quotient 3 as the next digit in the result. 
Result so far: 753.0
Subtract 21 from 24 to get 3.
Take the next digit (2) from the dividend and append it to 3, then repeat: 32 / 7

Going ahead to step 5:
The number 7 fits into 32 4 times, leaving a remainder of 4.
The number 4 becomes the next digit in our result. 
Result so far: 7534.0
Deduct 28 from 32 and we're left with 4.
Bring next digit (1) of the dividend behind the 4 and repeat the process: 41 / 7

Step 6:
7 can be fit into 41 5 times, resulting in a remainder of 6.
Record the quotient 5 as the next digit in the result. 
Result so far: 75345.0
If we take 35 away from 41, 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.

Advancing to step 7:
When dividing 60 by 7, we get 8 with a remainder of 4.
The number 8 becomes the next digit in our result. 
Result so far: 75345.8
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.

On to step 8:
When dividing 40 by 7, we get 5 with a remainder of 5.
The number 5 becomes the next digit in our result. 
Result so far: 75345.85
Subtracting 35 from 40 leaves us 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.

Let's proceed to step 9:
50 divided by 7 is 7 with a remainder of 1.
The number 7 becomes the next digit in our result. 
Result so far: 75345.857
If we subtract 49 from 50, we 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.

On to step 10:
When dividing 10 by 7, we get 1 with a remainder of 3.
Put 1 as the next digit of the answer. 
Result so far: 75345.8571
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.

Advancing to step 11:
The number 7 fits into 30 4 times, leaving a remainder of 2.
The next digit of our result is 4. 
Result so far: 75345.85714
Deduct 28 from 30 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.

Advancing to step 12:
7 goes into 20 2 times with a remainder of 6.
Use 2 as the next digit of our solution. 
Result so far: 75345.857142
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.

Going ahead to step 13:
7 can be fit into 60 8 times, resulting in a remainder of 4.
The number 8 becomes the next digit in our result. 
Result so far: 75345.8571428
The remainder is 4 after subtracting 56 from 60.
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 14:
40 divided by 7 is 5 with a remainder of 5.
The next digit of our result is 5. 
Result so far: 75345.85714285
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.

The quotient of the division is 75345.85714285, and the remainder is 5e-09.