We look at the division of 2336792 by 643 
The aim is to understand the frequency of 643 in 2336792.

On to step 1:
When dividing 2 by 643, we get 0 with a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 2 after subtracting 0 from 2.
Append the next digit (3) from the dividend to 2 and continue with: 23 / 643

Advancing to step 2:
The number 643 fits into 23 0 times, leaving a remainder of 23.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 23, we get 23.
Grab the next digit (3) from the dividend, add it to 23, then carry on: 233 / 643

Going ahead to step 3:
233 divided by 643 is 0 with a remainder of 233.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 233 to get 233.
Take the next digit (6) from the dividend and append it to 233, then repeat: 2336 / 643

Advancing to step 4:
643 can be fit into 2336 3 times, resulting in a remainder of 407.
Write down 3 as next digit of the result. 
Result so far: 3.0
Deduct 1929 from 2336 and we're left with 407.
Fetch the next digit (7) from the dividend, attach it to 407 and continue: 4077 / 643

Advancing to step 5:
4077 divided by 643 is 6 with a remainder of 219.
Record the quotient 6 as the next digit in the result. 
Result so far: 36.0
Deduct 3858 from 4077 and we're left with 219.
Grab the next digit (9) from the dividend, add it to 219, then carry on: 2199 / 643

Let's proceed to step 6:
643 can be fit into 2199 3 times, resulting in a remainder of 270.
The number 3 becomes the next digit in our result. 
Result so far: 363.0
If we take 1929 away from 2199, we end up with 270.
Append the next digit (2) from the dividend to 270 and continue with: 2702 / 643

Going ahead to step 7:
If we divide 2702 by 643, we get 4 and a remainder of 130.
The number 4 becomes the next digit in our result. 
Result so far: 3634.0
Deduct 2572 from 2702 and we're left with 130.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1300, and continue the process.

Let's proceed to step 8:
643 can be fit into 1300 2 times, resulting in a remainder of 14.
Write down 2 as next digit of the result. 
Result so far: 3634.2
The remainder is 14 after subtracting 1286 from 1300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Let's proceed to step 9:
140 divided by 643 is 0 with a remainder of 140.
Use 0 as the next digit of our solution. 
Result so far: 3634.2
If we subtract 0 from 140, we get 140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1400, and continue the process.

Let's proceed to step 10:
643 goes into 1400 2 times with a remainder of 114.
Use 2 as the next digit of our solution. 
Result so far: 3634.202
If we take 1286 away from 1400, we end up with 114.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1140, and continue the process.

Advancing to step 11:
The number 643 fits into 1140 1 times, leaving a remainder of 497.
Put 1 as the next digit of the answer. 
Result so far: 3634.2021
Deduct 643 from 1140 and we're left with 497.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4970, and continue the process.

Going ahead to step 12:
If we divide 4970 by 643, we get 7 and a remainder of 469.
The number 7 becomes the next digit in our result. 
Result so far: 3634.20217
If we take 4501 away from 4970, we end up with 469.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4690, and continue the process.

Going ahead to step 13:
643 can be fit into 4690 7 times, resulting in a remainder of 189.
Put 7 as the next digit of the answer. 
Result so far: 3634.202177
Deduct 4501 from 4690 and we're left with 189.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1890, and continue the process.

The final outcome is 3634.202177, with a leftover of 1.89e-05.