We look at the division of 85960242 by 643 
The aim is to understand the frequency of 643 in 85960242.

Step 1:
If we divide 8 by 643, we get 0 and a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Append the next digit (5) from the dividend to 8 and continue with: 85 / 643

Moving on to step 2:
85 divided by 643 is 0 with a remainder of 85.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 85, we get 85.
Bring next digit (9) of the dividend behind the 85 and repeat the process: 859 / 643

Let's proceed to step 3:
The number 643 fits into 859 1 times, leaving a remainder of 216.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Subtracting 643 from 859 leaves us with 216.
Fetch the next digit (6) from the dividend, attach it to 216 and continue: 2166 / 643

Step 4:
If we divide 2166 by 643, we get 3 and a remainder of 237.
Write down 3 as next digit of the result. 
Result so far: 13.0
If we take 1929 away from 2166, we end up with 237.
Take the next digit (0) from the dividend and append it to 237, then repeat: 2370 / 643

Step 5:
643 can be fit into 2370 3 times, resulting in a remainder of 441.
The next digit of our result is 3. 
Result so far: 133.0
Deduct 1929 from 2370 and we're left with 441.
Include the next digit (2) from the dividend after 441, then repeat: 4412 / 643

Let's proceed to step 6:
When dividing 4412 by 643, we get 6 with a remainder of 554.
Put 6 as the next digit of the answer. 
Result so far: 1336.0
Deduct 3858 from 4412 and we're left with 554.
Append the next digit (4) from the dividend to 554 and continue with: 5544 / 643

Advancing to step 7:
5544 divided by 643 is 8 with a remainder of 400.
Write down 8 as next digit of the result. 
Result so far: 13368.0
Deduct 5144 from 5544 and we're left with 400.
Include the next digit (2) from the dividend after 400, then repeat: 4002 / 643

Moving on to step 8:
If we divide 4002 by 643, we get 6 and a remainder of 144.
Use 6 as the next digit of our solution. 
Result so far: 133686.0
If we take 3858 away from 4002, we end up with 144.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1440, and continue the process.

Moving on to step 9:
1440 divided by 643 is 2 with a remainder of 154.
Use 2 as the next digit of our solution. 
Result so far: 133686.2
Subtract 1286 from 1440 to get 154.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1540, and continue the process.

Let's proceed to step 10:
When dividing 1540 by 643, we get 2 with a remainder of 254.
Record the quotient 2 as the next digit in the result. 
Result so far: 133686.22
The remainder is 254 after subtracting 1286 from 1540.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2540, and continue the process.

The quotient of the division is 133686.22, and the remainder is 0.254.