Let's divide 644282 by 7
The aim is to understand the frequency of 7 in 644282.

On to step 1:
If we divide 6 by 7, we get 0 and a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Append the next digit (4) from the dividend to 6 and continue with: 64 / 7

Moving on to step 2:
7 goes into 64 9 times with a remainder of 1.
The next digit of our result is 9. 
Result so far: 9.0
If we subtract 63 from 64, we get 1.
Include the next digit (4) from the dividend after 1, then repeat: 14 / 7

Advancing to step 3:
7 goes into 14 2 times with a remainder of 0.
Use 2 as the next digit of our solution. 
Result so far: 92.0
Subtract 14 from 14 to get 0.
Fetch the next digit (2) from the dividend, attach it to 0 and continue: 2 / 7

Moving on to step 4:
If we divide 2 by 7, we get 0 and a remainder of 2.
Record the quotient 0 as the next digit in the result. 
Result so far: 920.0
Subtract 0 from 2 to get 2.
Include the next digit (8) from the dividend after 2, then repeat: 28 / 7

Going ahead to step 5:
28 divided by 7 is 4 with a remainder of 0.
Use 4 as the next digit of our solution. 
Result so far: 9204.0
Subtracting 28 from 28 leaves us with 0.
Fetch the next digit (2) from the dividend, attach it to 0 and continue: 2 / 7

Step 6:
7 goes into 2 0 times with a remainder of 2.
Write down 0 as next digit of the result. 
Result so far: 92040.0
If we take 0 away from 2, 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.

Step 7:
7 goes into 20 2 times with a remainder of 6.
Record the quotient 2 as the next digit in the result. 
Result so far: 92040.2
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.

On to step 8:
60 divided by 7 is 8 with a remainder of 4.
Write down 8 as next digit of the result. 
Result so far: 92040.28
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.

Let's proceed 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: 92040.285
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.

Advancing to step 10:
If we divide 50 by 7, we get 7 and a remainder of 1.
The number 7 becomes the next digit in our result. 
Result so far: 92040.2857
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:
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: 92040.28571
Subtracting 7 from 10 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.

Moving on to step 12:
If we divide 30 by 7, we get 4 and a remainder of 2.
The number 4 becomes the next digit in our result. 
Result so far: 92040.285714
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.

Moving on to step 13:
The number 7 fits into 20 2 times, leaving a remainder of 6.
Record the quotient 2 as the next digit in the result. 
Result so far: 92040.2857142
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.

Let's proceed to step 14:
60 divided by 7 is 8 with a remainder of 4.
Put 8 as the next digit of the answer. 
Result so far: 92040.28571428
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.

The quotient of the division is 92040.28571428, and the remainder is 4e-09.