36489120 divided by 643 
The aim is to understand the frequency of 643 in 36489120.

Step 1:
643 can be fit into 3 0 times, resulting in a remainder of 3.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 3 to get 3.
Grab the next digit (6) from the dividend, add it to 3, then carry on: 36 / 643

On to step 2:
When dividing 36 by 643, we get 0 with a remainder of 36.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 36, we end up with 36.
Include the next digit (4) from the dividend after 36, then repeat: 364 / 643

On to step 3:
643 goes into 364 0 times with a remainder of 364.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 364 and we're left with 364.
Fetch the next digit (8) from the dividend, attach it to 364 and continue: 3648 / 643

Let's proceed to step 4:
When dividing 3648 by 643, we get 5 with a remainder of 433.
The next digit of our result is 5. 
Result so far: 5.0
If we take 3215 away from 3648, we end up with 433.
Grab the next digit (9) from the dividend, add it to 433, then carry on: 4339 / 643

Going ahead to step 5:
4339 divided by 643 is 6 with a remainder of 481.
Record the quotient 6 as the next digit in the result. 
Result so far: 56.0
Subtract 3858 from 4339 to get 481.
Fetch the next digit (1) from the dividend, attach it to 481 and continue: 4811 / 643

Moving on to step 6:
643 goes into 4811 7 times with a remainder of 310.
Put 7 as the next digit of the answer. 
Result so far: 567.0
Subtract 4501 from 4811 to get 310.
Append the next digit (2) from the dividend to 310 and continue with: 3102 / 643

On to step 7:
3102 divided by 643 is 4 with a remainder of 530.
The number 4 becomes the next digit in our result. 
Result so far: 5674.0
The remainder is 530 after subtracting 2572 from 3102.
Grab the next digit (0) from the dividend, add it to 530, then carry on: 5300 / 643

Moving on to step 8:
643 can be fit into 5300 8 times, resulting in a remainder of 156.
Put 8 as the next digit of the answer. 
Result so far: 56748.0
If we take 5144 away from 5300, we end up with 156.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1560, and continue the process.

Step 9:
643 can be fit into 1560 2 times, resulting in a remainder of 274.
The number 2 becomes the next digit in our result. 
Result so far: 56748.2
The remainder is 274 after subtracting 1286 from 1560.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2740, and continue the process.

Let's proceed to step 10:
643 goes into 2740 4 times with a remainder of 168.
Record the quotient 4 as the next digit in the result. 
Result so far: 56748.24
Subtract 2572 from 2740 to get 168.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1680, and continue the process.

On to step 11:
The number 643 fits into 1680 2 times, leaving a remainder of 394.
Write down 2 as next digit of the result. 
Result so far: 56748.242
If we subtract 1286 from 1680, we get 394.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3940, and continue the process.

Moving on to step 12:
643 goes into 3940 6 times with a remainder of 82.
Record the quotient 6 as the next digit in the result. 
Result so far: 56748.2426
The remainder is 82 after subtracting 3858 from 3940.
Since there are no more digits in the dividend, we add a zero to the remainder making it 820, and continue the process.

Advancing to step 13:
820 divided by 643 is 1 with a remainder of 177.
Record the quotient 1 as the next digit in the result. 
Result so far: 56748.24261
If we take 643 away from 820, we end up with 177.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1770, and continue the process.

Going ahead to step 14:
When dividing 1770 by 643, we get 2 with a remainder of 484.
The next digit of our result is 2. 
Result so far: 56748.242612
Deduct 1286 from 1770 and we're left with 484.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4840, and continue the process.

Going ahead to step 15:
When dividing 4840 by 643, we get 7 with a remainder of 339.
Use 7 as the next digit of our solution. 
Result so far: 56748.2426127
The remainder is 339 after subtracting 4501 from 4840.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3390, and continue the process.

Moving on to step 16:
If we divide 3390 by 643, we get 5 and a remainder of 175.
The number 5 becomes the next digit in our result. 
Result so far: 56748.24261275
If we take 3215 away from 3390, we end up with 175.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1750, and continue the process.

After the division, we end up with 56748.24261275 and a remainder of 1.75e-07.