We look at the division of 643848 by 70 
The aim is to understand the frequency of 70 in 643848.

Moving on to step 1:
70 can be fit into 6 0 times, resulting in a remainder of 6.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 6, we end up with 6.
Bring next digit (4) of the dividend behind the 6 and repeat the process: 64 / 70

On to step 2:
If we divide 64 by 70, we get 0 and a remainder of 64.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 64, we end up with 64.
Append the next digit (3) from the dividend to 64 and continue with: 643 / 70

On to step 3:
The number 70 fits into 643 9 times, leaving a remainder of 13.
Use 9 as the next digit of our solution. 
Result so far: 9.0
If we take 630 away from 643, we end up with 13.
Take the next digit (8) from the dividend and append it to 13, then repeat: 138 / 70

Advancing to step 4:
The number 70 fits into 138 1 times, leaving a remainder of 68.
Write down 1 as next digit of the result. 
Result so far: 91.0
If we subtract 70 from 138, we get 68.
Include the next digit (4) from the dividend after 68, then repeat: 684 / 70

Step 5:
The number 70 fits into 684 9 times, leaving a remainder of 54.
Write down 9 as next digit of the result. 
Result so far: 919.0
If we subtract 630 from 684, we get 54.
Include the next digit (8) from the dividend after 54, then repeat: 548 / 70

Going ahead to step 6:
The number 70 fits into 548 7 times, leaving a remainder of 58.
Use 7 as the next digit of our solution. 
Result so far: 9197.0
If we take 490 away from 548, we end up with 58.
Since there are no more digits in the dividend, we add a zero to the remainder making it 580, and continue the process.

On to step 7:
If we divide 580 by 70, we get 8 and a remainder of 20.
Put 8 as the next digit of the answer. 
Result so far: 9197.8
Subtract 560 from 580 to get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Let's proceed to step 8:
70 goes into 200 2 times with a remainder of 60.
The next digit of our result is 2. 
Result so far: 9197.82
Subtract 140 from 200 to get 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

On to step 9:
70 goes into 600 8 times with a remainder of 40.
The next digit of our result is 8. 
Result so far: 9197.828
If we subtract 560 from 600, we get 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Step 10:
400 divided by 70 is 5 with a remainder of 50.
Use 5 as the next digit of our solution. 
Result so far: 9197.8285
If we subtract 350 from 400, we get 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Going ahead to step 11:
70 goes into 500 7 times with a remainder of 10.
The next digit of our result is 7. 
Result so far: 9197.82857
If we take 490 away from 500, we end up with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Going ahead to step 12:
100 divided by 70 is 1 with a remainder of 30.
Put 1 as the next digit of the answer. 
Result so far: 9197.828571
If we take 70 away from 100, we end up with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Step 13:
When dividing 300 by 70, we get 4 with a remainder of 20.
Write down 4 as next digit of the result. 
Result so far: 9197.8285714
If we take 280 away from 300, we end up with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Going ahead to step 14:
200 divided by 70 is 2 with a remainder of 60.
The next digit of our result is 2. 
Result so far: 9197.82857142
Subtracting 140 from 200 leaves us with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

The final result is 9197.82857142 with a remainder of 6e-08.