We divide 83785830 by 643
The aim is to understand the frequency of 643 in 83785830.

Advancing to step 1:
643 goes into 8 0 times with a remainder of 8.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 8, we end up with 8.
Bring next digit (3) of the dividend behind the 8 and repeat the process: 83 / 643

Let's proceed to step 2:
643 can be fit into 83 0 times, resulting in a remainder of 83.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 83 to get 83.
Take the next digit (7) from the dividend and append it to 83, then repeat: 837 / 643

On to step 3:
The number 643 fits into 837 1 times, leaving a remainder of 194.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
Subtract 643 from 837 to get 194.
Include the next digit (8) from the dividend after 194, then repeat: 1948 / 643

Going ahead to step 4:
When dividing 1948 by 643, we get 3 with a remainder of 19.
Use 3 as the next digit of our solution. 
Result so far: 13.0
Subtracting 1929 from 1948 leaves us with 19.
Fetch the next digit (5) from the dividend, attach it to 19 and continue: 195 / 643

Moving on to step 5:
The number 643 fits into 195 0 times, leaving a remainder of 195.
Write down 0 as next digit of the result. 
Result so far: 130.0
If we take 0 away from 195, we end up with 195.
Grab the next digit (8) from the dividend, add it to 195, then carry on: 1958 / 643

Going ahead to step 6:
If we divide 1958 by 643, we get 3 and a remainder of 29.
Use 3 as the next digit of our solution. 
Result so far: 1303.0
Subtract 1929 from 1958 to get 29.
Append the next digit (3) from the dividend to 29 and continue with: 293 / 643

Going ahead to step 7:
643 can be fit into 293 0 times, resulting in a remainder of 293.
Write down 0 as next digit of the result. 
Result so far: 13030.0
The remainder is 293 after subtracting 0 from 293.
Fetch the next digit (0) from the dividend, attach it to 293 and continue: 2930 / 643

Moving on to step 8:
2930 divided by 643 is 4 with a remainder of 358.
Put 4 as the next digit of the answer. 
Result so far: 130304.0
Subtract 2572 from 2930 to get 358.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3580, and continue the process.

Advancing to step 9:
When dividing 3580 by 643, we get 5 with a remainder of 365.
The number 5 becomes the next digit in our result. 
Result so far: 130304.5
Subtract 3215 from 3580 to get 365.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3650, and continue the process.

Let's proceed to step 10:
643 goes into 3650 5 times with a remainder of 435.
Record the quotient 5 as the next digit in the result. 
Result so far: 130304.55
Subtracting 3215 from 3650 leaves us with 435.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4350, and continue the process.

The final result is 130304.55 with a remainder of 0.435.