We divide 17687903 by 643
The aim is to understand the frequency of 643 in 17687903.

Step 1:
1 divided by 643 is 0 with a remainder of 1.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 1 leaves us with 1.
Include the next digit (7) from the dividend after 1, then repeat: 17 / 643

Step 2:
The number 643 fits into 17 0 times, leaving a remainder of 17.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 17, we end up with 17.
Bring next digit (6) of the dividend behind the 17 and repeat the process: 176 / 643

Let's proceed to step 3:
When dividing 176 by 643, we get 0 with a remainder of 176.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 176, we end up with 176.
Bring next digit (8) of the dividend behind the 176 and repeat the process: 1768 / 643

On to step 4:
643 goes into 1768 2 times with a remainder of 482.
The next digit of our result is 2. 
Result so far: 2.0
Subtracting 1286 from 1768 leaves us with 482.
Include the next digit (7) from the dividend after 482, then repeat: 4827 / 643

Going ahead to step 5:
When dividing 4827 by 643, we get 7 with a remainder of 326.
Put 7 as the next digit of the answer. 
Result so far: 27.0
The remainder is 326 after subtracting 4501 from 4827.
Bring next digit (9) of the dividend behind the 326 and repeat the process: 3269 / 643

Step 6:
When dividing 3269 by 643, we get 5 with a remainder of 54.
The next digit of our result is 5. 
Result so far: 275.0
Deduct 3215 from 3269 and we're left with 54.
Take the next digit (0) from the dividend and append it to 54, then repeat: 540 / 643

Going ahead to step 7:
643 goes into 540 0 times with a remainder of 540.
Record the quotient 0 as the next digit in the result. 
Result so far: 2750.0
Subtracting 0 from 540 leaves us with 540.
Include the next digit (3) from the dividend after 540, then repeat: 5403 / 643

Step 8:
When dividing 5403 by 643, we get 8 with a remainder of 259.
The next digit of our result is 8. 
Result so far: 27508.0
If we take 5144 away from 5403, we end up with 259.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2590, and continue the process.

Moving on to step 9:
The number 643 fits into 2590 4 times, leaving a remainder of 18.
Write down 4 as next digit of the result. 
Result so far: 27508.4
Deduct 2572 from 2590 and we're left with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Advancing to step 10:
When dividing 180 by 643, we get 0 with a remainder of 180.
The number 0 becomes the next digit in our result. 
Result so far: 27508.4
The remainder is 180 after subtracting 0 from 180.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1800, and continue the process.

Moving on to step 11:
The number 643 fits into 1800 2 times, leaving a remainder of 514.
The number 2 becomes the next digit in our result. 
Result so far: 27508.402
If we subtract 1286 from 1800, we get 514.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5140, and continue the process.

Going ahead to step 12:
643 can be fit into 5140 7 times, resulting in a remainder of 639.
The number 7 becomes the next digit in our result. 
Result so far: 27508.4027
The remainder is 639 after subtracting 4501 from 5140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6390, and continue the process.

On to step 13:
If we divide 6390 by 643, we get 9 and a remainder of 603.
Write down 9 as next digit of the result. 
Result so far: 27508.40279
Subtracting 5787 from 6390 leaves us with 603.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6030, and continue the process.

Advancing to step 14:
If we divide 6030 by 643, we get 9 and a remainder of 243.
The number 9 becomes the next digit in our result. 
Result so far: 27508.402799
Subtracting 5787 from 6030 leaves us with 243.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2430, and continue the process.

Our division results in 27508.402799 with a remaining 2.43e-05.