We look at the division of 57654461 by 643 
The aim is to understand the frequency of 643 in 57654461.

Moving on to step 1:
643 can be fit into 5 0 times, resulting in a remainder of 5.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 5 leaves us with 5.
Fetch the next digit (7) from the dividend, attach it to 5 and continue: 57 / 643

Let's proceed to step 2:
When dividing 57 by 643, we get 0 with a remainder of 57.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 57 after subtracting 0 from 57.
Include the next digit (6) from the dividend after 57, then repeat: 576 / 643

On to step 3:
When dividing 576 by 643, we get 0 with a remainder of 576.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 576 to get 576.
Append the next digit (5) from the dividend to 576 and continue with: 5765 / 643

Advancing to step 4:
643 goes into 5765 8 times with a remainder of 621.
Put 8 as the next digit of the answer. 
Result so far: 8.0
Deduct 5144 from 5765 and we're left with 621.
Bring next digit (4) of the dividend behind the 621 and repeat the process: 6214 / 643

Advancing to step 5:
If we divide 6214 by 643, we get 9 and a remainder of 427.
Use 9 as the next digit of our solution. 
Result so far: 89.0
If we subtract 5787 from 6214, we get 427.
Include the next digit (4) from the dividend after 427, then repeat: 4274 / 643

Step 6:
If we divide 4274 by 643, we get 6 and a remainder of 416.
Write down 6 as next digit of the result. 
Result so far: 896.0
If we subtract 3858 from 4274, we get 416.
Fetch the next digit (6) from the dividend, attach it to 416 and continue: 4166 / 643

Let's proceed to step 7:
643 goes into 4166 6 times with a remainder of 308.
The next digit of our result is 6. 
Result so far: 8966.0
Subtracting 3858 from 4166 leaves us with 308.
Bring next digit (1) of the dividend behind the 308 and repeat the process: 3081 / 643

On to step 8:
The number 643 fits into 3081 4 times, leaving a remainder of 509.
The number 4 becomes the next digit in our result. 
Result so far: 89664.0
If we subtract 2572 from 3081, we get 509.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5090, and continue the process.

On to step 9:
The number 643 fits into 5090 7 times, leaving a remainder of 589.
Write down 7 as next digit of the result. 
Result so far: 89664.7
Subtract 4501 from 5090 to get 589.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5890, and continue the process.

Advancing to step 10:
643 goes into 5890 9 times with a remainder of 103.
The number 9 becomes the next digit in our result. 
Result so far: 89664.79
The remainder is 103 after subtracting 5787 from 5890.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1030, and continue the process.

Step 11:
If we divide 1030 by 643, we get 1 and a remainder of 387.
The next digit of our result is 1. 
Result so far: 89664.791
The remainder is 387 after subtracting 643 from 1030.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3870, and continue the process.

Going ahead to step 12:
643 goes into 3870 6 times with a remainder of 12.
Record the quotient 6 as the next digit in the result. 
Result so far: 89664.7916
If we take 3858 away from 3870, we end up with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Moving on to step 13:
643 goes into 120 0 times with a remainder of 120.
Put 0 as the next digit of the answer. 
Result so far: 89664.7916
The remainder is 120 after subtracting 0 from 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1200, and continue the process.

Going ahead to step 14:
643 goes into 1200 1 times with a remainder of 557.
The next digit of our result is 1. 
Result so far: 89664.791601
The remainder is 557 after subtracting 643 from 1200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5570, and continue the process.

Let's proceed to step 15:
The number 643 fits into 5570 8 times, leaving a remainder of 426.
Use 8 as the next digit of our solution. 
Result so far: 89664.7916018
The remainder is 426 after subtracting 5144 from 5570.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4260, and continue the process.

On to step 16:
643 goes into 4260 6 times with a remainder of 402.
Put 6 as the next digit of the answer. 
Result so far: 89664.79160186
Subtract 3858 from 4260 to get 402.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4020, and continue the process.

The quotient of the division is 89664.79160186, and the remainder is 4.02e-07.