We look at the division of 40659003 by 643 
The aim is to understand the frequency of 643 in 40659003.

Let's proceed to step 1:
643 goes into 4 0 times with a remainder of 4.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 4 to get 4.
Include the next digit (0) from the dividend after 4, then repeat: 40 / 643

Going ahead to step 2:
If we divide 40 by 643, we get 0 and a remainder of 40.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 40 and we're left with 40.
Grab the next digit (6) from the dividend, add it to 40, then carry on: 406 / 643

Step 3:
If we divide 406 by 643, we get 0 and a remainder of 406.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 406 leaves us with 406.
Take the next digit (5) from the dividend and append it to 406, then repeat: 4065 / 643

Let's proceed to step 4:
If we divide 4065 by 643, we get 6 and a remainder of 207.
Write down 6 as next digit of the result. 
Result so far: 6.0
Deduct 3858 from 4065 and we're left with 207.
Take the next digit (9) from the dividend and append it to 207, then repeat: 2079 / 643

Going ahead to step 5:
The number 643 fits into 2079 3 times, leaving a remainder of 150.
The next digit of our result is 3. 
Result so far: 63.0
If we take 1929 away from 2079, we end up with 150.
Take the next digit (0) from the dividend and append it to 150, then repeat: 1500 / 643

Going ahead to step 6:
When dividing 1500 by 643, we get 2 with a remainder of 214.
The next digit of our result is 2. 
Result so far: 632.0
The remainder is 214 after subtracting 1286 from 1500.
Append the next digit (0) from the dividend to 214 and continue with: 2140 / 643

Going ahead to step 7:
The number 643 fits into 2140 3 times, leaving a remainder of 211.
Use 3 as the next digit of our solution. 
Result so far: 6323.0
Subtract 1929 from 2140 to get 211.
Append the next digit (3) from the dividend to 211 and continue with: 2113 / 643

Let's proceed to step 8:
2113 divided by 643 is 3 with a remainder of 184.
The next digit of our result is 3. 
Result so far: 63233.0
Subtracting 1929 from 2113 leaves us with 184.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1840, and continue the process.

Moving on to step 9:
643 goes into 1840 2 times with a remainder of 554.
Record the quotient 2 as the next digit in the result. 
Result so far: 63233.2
The remainder is 554 after subtracting 1286 from 1840.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5540, and continue the process.

On to step 10:
When dividing 5540 by 643, we get 8 with a remainder of 396.
Write down 8 as next digit of the result. 
Result so far: 63233.28
The remainder is 396 after subtracting 5144 from 5540.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3960, and continue the process.

Advancing to step 11:
643 goes into 3960 6 times with a remainder of 102.
The next digit of our result is 6. 
Result so far: 63233.286
Subtract 3858 from 3960 to get 102.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1020, and continue the process.

Step 12:
If we divide 1020 by 643, we get 1 and a remainder of 377.
Record the quotient 1 as the next digit in the result. 
Result so far: 63233.2861
The remainder is 377 after subtracting 643 from 1020.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3770, and continue the process.

Let's proceed to step 13:
The number 643 fits into 3770 5 times, leaving a remainder of 555.
Use 5 as the next digit of our solution. 
Result so far: 63233.28615
Subtract 3215 from 3770 to get 555.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5550, and continue the process.

Let's proceed to step 14:
The number 643 fits into 5550 8 times, leaving a remainder of 406.
The number 8 becomes the next digit in our result. 
Result so far: 63233.286158
Subtract 5144 from 5550 to get 406.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4060, and continue the process.

On to step 15:
The number 643 fits into 4060 6 times, leaving a remainder of 202.
Record the quotient 6 as the next digit in the result. 
Result so far: 63233.2861586
Deduct 3858 from 4060 and we're left with 202.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2020, and continue the process.

Going ahead to step 16:
When dividing 2020 by 643, we get 3 with a remainder of 91.
Put 3 as the next digit of the answer. 
Result so far: 63233.28615863
Subtract 1929 from 2020 to get 91.
Since there are no more digits in the dividend, we add a zero to the remainder making it 910, and continue the process.

The final outcome is 63233.28615863, with a leftover of 9.1e-08.