74206379 ÷ 643 
The aim is to understand the frequency of 643 in 74206379.

Moving on to step 1:
If we divide 7 by 643, we get 0 and a remainder of 7.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 7 leaves us with 7.
Bring next digit (4) of the dividend behind the 7 and repeat the process: 74 / 643

Moving on to step 2:
643 goes into 74 0 times with a remainder of 74.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 74 to get 74.
Append the next digit (2) from the dividend to 74 and continue with: 742 / 643

Going ahead to step 3:
643 can be fit into 742 1 times, resulting in a remainder of 99.
The next digit of our result is 1. 
Result so far: 1.0
Subtracting 643 from 742 leaves us with 99.
Include the next digit (0) from the dividend after 99, then repeat: 990 / 643

Let's proceed to step 4:
643 goes into 990 1 times with a remainder of 347.
Write down 1 as next digit of the result. 
Result so far: 11.0
Deduct 643 from 990 and we're left with 347.
Append the next digit (6) from the dividend to 347 and continue with: 3476 / 643

Moving on to step 5:
If we divide 3476 by 643, we get 5 and a remainder of 261.
Record the quotient 5 as the next digit in the result. 
Result so far: 115.0
Deduct 3215 from 3476 and we're left with 261.
Append the next digit (3) from the dividend to 261 and continue with: 2613 / 643

Advancing to step 6:
2613 divided by 643 is 4 with a remainder of 41.
Use 4 as the next digit of our solution. 
Result so far: 1154.0
Subtracting 2572 from 2613 leaves us with 41.
Bring next digit (7) of the dividend behind the 41 and repeat the process: 417 / 643

On to step 7:
417 divided by 643 is 0 with a remainder of 417.
Put 0 as the next digit of the answer. 
Result so far: 11540.0
Deduct 0 from 417 and we're left with 417.
Grab the next digit (9) from the dividend, add it to 417, then carry on: 4179 / 643

Advancing to step 8:
643 goes into 4179 6 times with a remainder of 321.
The number 6 becomes the next digit in our result. 
Result so far: 115406.0
The remainder is 321 after subtracting 3858 from 4179.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3210, and continue the process.

Moving on to step 9:
3210 divided by 643 is 4 with a remainder of 638.
The next digit of our result is 4. 
Result so far: 115406.4
Deduct 2572 from 3210 and we're left with 638.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6380, and continue the process.

Step 10:
The number 643 fits into 6380 9 times, leaving a remainder of 593.
The next digit of our result is 9. 
Result so far: 115406.49
Subtract 5787 from 6380 to get 593.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5930, and continue the process.

Going ahead to step 11:
643 goes into 5930 9 times with a remainder of 143.
Use 9 as the next digit of our solution. 
Result so far: 115406.499
Deduct 5787 from 5930 and we're left with 143.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1430, and continue the process.

The final outcome is 115406.499, with a leftover of 0.0143.