52708190 divided by 643 
The aim is to understand the frequency of 643 in 52708190.

On to step 1:
If we divide 5 by 643, we get 0 and a remainder of 5.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 5, we get 5.
Bring next digit (2) of the dividend behind the 5 and repeat the process: 52 / 643

Moving on to step 2:
643 can be fit into 52 0 times, resulting in a remainder of 52.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 52 and we're left with 52.
Include the next digit (7) from the dividend after 52, then repeat: 527 / 643

Moving on to step 3:
643 goes into 527 0 times with a remainder of 527.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 527, we end up with 527.
Fetch the next digit (0) from the dividend, attach it to 527 and continue: 5270 / 643

Going ahead to step 4:
When dividing 5270 by 643, we get 8 with a remainder of 126.
Put 8 as the next digit of the answer. 
Result so far: 8.0
If we subtract 5144 from 5270, we get 126.
Include the next digit (8) from the dividend after 126, then repeat: 1268 / 643

Moving on to step 5:
The number 643 fits into 1268 1 times, leaving a remainder of 625.
Use 1 as the next digit of our solution. 
Result so far: 81.0
If we take 643 away from 1268, we end up with 625.
Bring next digit (1) of the dividend behind the 625 and repeat the process: 6251 / 643

Advancing to step 6:
6251 divided by 643 is 9 with a remainder of 464.
Put 9 as the next digit of the answer. 
Result so far: 819.0
If we subtract 5787 from 6251, we get 464.
Grab the next digit (9) from the dividend, add it to 464, then carry on: 4649 / 643

Going ahead to step 7:
If we divide 4649 by 643, we get 7 and a remainder of 148.
Use 7 as the next digit of our solution. 
Result so far: 8197.0
Subtract 4501 from 4649 to get 148.
Take the next digit (0) from the dividend and append it to 148, then repeat: 1480 / 643

Let's proceed to step 8:
643 goes into 1480 2 times with a remainder of 194.
Write down 2 as next digit of the result. 
Result so far: 81972.0
Subtract 1286 from 1480 to get 194.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1940, and continue the process.

Let's proceed to step 9:
643 can be fit into 1940 3 times, resulting in a remainder of 11.
Record the quotient 3 as the next digit in the result. 
Result so far: 81972.3
If we take 1929 away from 1940, we end up with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Going ahead to step 10:
The number 643 fits into 110 0 times, leaving a remainder of 110.
Write down 0 as next digit of the result. 
Result so far: 81972.3
Subtracting 0 from 110 leaves us with 110.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1100, and continue the process.

Going ahead to step 11:
643 goes into 1100 1 times with a remainder of 457.
The number 1 becomes the next digit in our result. 
Result so far: 81972.301
Deduct 643 from 1100 and we're left with 457.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4570, and continue the process.

Step 12:
4570 divided by 643 is 7 with a remainder of 69.
The number 7 becomes the next digit in our result. 
Result so far: 81972.3017
If we subtract 4501 from 4570, we get 69.
Since there are no more digits in the dividend, we add a zero to the remainder making it 690, and continue the process.

Going ahead to step 13:
When dividing 690 by 643, we get 1 with a remainder of 47.
The next digit of our result is 1. 
Result so far: 81972.30171
The remainder is 47 after subtracting 643 from 690.
Since there are no more digits in the dividend, we add a zero to the remainder making it 470, and continue the process.

Let's proceed to step 14:
643 goes into 470 0 times with a remainder of 470.
The next digit of our result is 0. 
Result so far: 81972.30171
If we take 0 away from 470, we end up with 470.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4700, and continue the process.

Moving on to step 15:
4700 divided by 643 is 7 with a remainder of 199.
Put 7 as the next digit of the answer. 
Result so far: 81972.3017107
The remainder is 199 after subtracting 4501 from 4700.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1990, and continue the process.

Going ahead to step 16:
643 goes into 1990 3 times with a remainder of 61.
Record the quotient 3 as the next digit in the result. 
Result so far: 81972.30171073
If we subtract 1929 from 1990, we get 61.
Since there are no more digits in the dividend, we add a zero to the remainder making it 610, and continue the process.

The final result is 81972.30171073 with a remainder of 6.1e-08.