520820 ÷ 43 
The aim is to understand the frequency of 43 in 520820.

On to step 1:
43 can be fit into 5 0 times, resulting in a remainder of 5.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 5 after subtracting 0 from 5.
Append the next digit (2) from the dividend to 5 and continue with: 52 / 43

Advancing to step 2:
43 can be fit into 52 1 times, resulting in a remainder of 9.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Deduct 43 from 52 and we're left with 9.
Append the next digit (0) from the dividend to 9 and continue with: 90 / 43

On to step 3:
The number 43 fits into 90 2 times, leaving a remainder of 4.
Use 2 as the next digit of our solution. 
Result so far: 12.0
Subtract 86 from 90 to get 4.
Grab the next digit (8) from the dividend, add it to 4, then carry on: 48 / 43

Step 4:
43 goes into 48 1 times with a remainder of 5.
Put 1 as the next digit of the answer. 
Result so far: 121.0
Subtracting 43 from 48 leaves us with 5.
Append the next digit (2) from the dividend to 5 and continue with: 52 / 43

Going ahead to step 5:
When dividing 52 by 43, we get 1 with a remainder of 9.
Put 1 as the next digit of the answer. 
Result so far: 1211.0
If we subtract 43 from 52, we get 9.
Bring next digit (0) of the dividend behind the 9 and repeat the process: 90 / 43

Going ahead to step 6:
The number 43 fits into 90 2 times, leaving a remainder of 4.
Use 2 as the next digit of our solution. 
Result so far: 12112.0
Subtract 86 from 90 to get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Step 7:
If we divide 40 by 43, we get 0 and a remainder of 40.
Put 0 as the next digit of the answer. 
Result so far: 12112.0
Deduct 0 from 40 and we're left with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Let's proceed to step 8:
The number 43 fits into 400 9 times, leaving a remainder of 13.
Record the quotient 9 as the next digit in the result. 
Result so far: 12112.09
The remainder is 13 after subtracting 387 from 400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Moving on to step 9:
If we divide 130 by 43, we get 3 and a remainder of 1.
Record the quotient 3 as the next digit in the result. 
Result so far: 12112.093
Subtracting 129 from 130 leaves us with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Step 10:
43 goes into 10 0 times with a remainder of 10.
The next digit of our result is 0. 
Result so far: 12112.093
If we take 0 away from 10, we end up with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

On to step 11:
43 can be fit into 100 2 times, resulting in a remainder of 14.
Record the quotient 2 as the next digit in the result. 
Result so far: 12112.09302
If we subtract 86 from 100, we get 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Moving on to step 12:
43 goes into 140 3 times with a remainder of 11.
Write down 3 as next digit of the result. 
Result so far: 12112.093023
Subtract 129 from 140 to get 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Step 13:
43 can be fit into 110 2 times, resulting in a remainder of 24.
The number 2 becomes the next digit in our result. 
Result so far: 12112.0930232
Subtract 86 from 110 to get 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Step 14:
The number 43 fits into 240 5 times, leaving a remainder of 25.
Write down 5 as next digit of the result. 
Result so far: 12112.09302325
If we subtract 215 from 240, we get 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

The final outcome is 12112.09302325, with a leftover of 2.5e-08.