We look at the division of 42042050 by 823 
The aim is to understand the frequency of 823 in 42042050.

On to step 1:
823 goes into 4 0 times with a remainder of 4.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 4 after subtracting 0 from 4.
Append the next digit (2) from the dividend to 4 and continue with: 42 / 823

Advancing to step 2:
If we divide 42 by 823, we get 0 and a remainder of 42.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 42 and we're left with 42.
Append the next digit (0) from the dividend to 42 and continue with: 420 / 823

On to step 3:
823 can be fit into 420 0 times, resulting in a remainder of 420.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 420 after subtracting 0 from 420.
Include the next digit (4) from the dividend after 420, then repeat: 4204 / 823

Going ahead to step 4:
823 can be fit into 4204 5 times, resulting in a remainder of 89.
Use 5 as the next digit of our solution. 
Result so far: 5.0
The remainder is 89 after subtracting 4115 from 4204.
Fetch the next digit (2) from the dividend, attach it to 89 and continue: 892 / 823

Moving on to step 5:
892 divided by 823 is 1 with a remainder of 69.
The next digit of our result is 1. 
Result so far: 51.0
The remainder is 69 after subtracting 823 from 892.
Include the next digit (0) from the dividend after 69, then repeat: 690 / 823

Advancing to step 6:
If we divide 690 by 823, we get 0 and a remainder of 690.
Write down 0 as next digit of the result. 
Result so far: 510.0
The remainder is 690 after subtracting 0 from 690.
Bring next digit (5) of the dividend behind the 690 and repeat the process: 6905 / 823

Let's proceed to step 7:
If we divide 6905 by 823, we get 8 and a remainder of 321.
Record the quotient 8 as the next digit in the result. 
Result so far: 5108.0
Subtracting 6584 from 6905 leaves us with 321.
Take the next digit (0) from the dividend and append it to 321, then repeat: 3210 / 823

Let's proceed to step 8:
When dividing 3210 by 823, we get 3 with a remainder of 741.
Put 3 as the next digit of the answer. 
Result so far: 51083.0
Subtracting 2469 from 3210 leaves us with 741.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7410, and continue the process.

Advancing to step 9:
823 goes into 7410 9 times with a remainder of 3.
Put 9 as the next digit of the answer. 
Result so far: 51083.9
If we take 7407 away from 7410, we end up with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Moving on to step 10:
823 goes into 30 0 times with a remainder of 30.
Record the quotient 0 as the next digit in the result. 
Result so far: 51083.9
If we take 0 away from 30, we end up with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Going ahead to step 11:
When dividing 300 by 823, we get 0 with a remainder of 300.
Use 0 as the next digit of our solution. 
Result so far: 51083.9
The remainder is 300 after subtracting 0 from 300.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3000, and continue the process.

After the division, we end up with 51083.9 and a remainder of 0.03.