We look at the division of 43029295 by 821 
The aim is to understand the frequency of 821 in 43029295.

Advancing to step 1:
The number 821 fits into 4 0 times, leaving a remainder of 4.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 4 to get 4.
Fetch the next digit (3) from the dividend, attach it to 4 and continue: 43 / 821

Moving on to step 2:
If we divide 43 by 821, we get 0 and a remainder of 43.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 43 after subtracting 0 from 43.
Bring next digit (0) of the dividend behind the 43 and repeat the process: 430 / 821

On to step 3:
430 divided by 821 is 0 with a remainder of 430.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 430 to get 430.
Append the next digit (2) from the dividend to 430 and continue with: 4302 / 821

Going ahead to step 4:
The number 821 fits into 4302 5 times, leaving a remainder of 197.
Record the quotient 5 as the next digit in the result. 
Result so far: 5.0
The remainder is 197 after subtracting 4105 from 4302.
Take the next digit (9) from the dividend and append it to 197, then repeat: 1979 / 821

Going ahead to step 5:
821 goes into 1979 2 times with a remainder of 337.
Record the quotient 2 as the next digit in the result. 
Result so far: 52.0
If we subtract 1642 from 1979, we get 337.
Take the next digit (2) from the dividend and append it to 337, then repeat: 3372 / 821

Going ahead to step 6:
821 can be fit into 3372 4 times, resulting in a remainder of 88.
Use 4 as the next digit of our solution. 
Result so far: 524.0
Subtract 3284 from 3372 to get 88.
Bring next digit (9) of the dividend behind the 88 and repeat the process: 889 / 821

Step 7:
821 can be fit into 889 1 times, resulting in a remainder of 68.
Use 1 as the next digit of our solution. 
Result so far: 5241.0
If we take 821 away from 889, we end up with 68.
Include the next digit (5) from the dividend after 68, then repeat: 685 / 821

Let's proceed to step 8:
685 divided by 821 is 0 with a remainder of 685.
The number 0 becomes the next digit in our result. 
Result so far: 52410.0
The remainder is 685 after subtracting 0 from 685.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6850, and continue the process.

On to step 9:
If we divide 6850 by 821, we get 8 and a remainder of 282.
Use 8 as the next digit of our solution. 
Result so far: 52410.8
Deduct 6568 from 6850 and we're left with 282.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2820, and continue the process.

Advancing to step 10:
When dividing 2820 by 821, we get 3 with a remainder of 357.
Write down 3 as next digit of the result. 
Result so far: 52410.83
Deduct 2463 from 2820 and we're left with 357.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3570, and continue the process.

Going ahead to step 11:
821 can be fit into 3570 4 times, resulting in a remainder of 286.
Write down 4 as next digit of the result. 
Result so far: 52410.834
If we take 3284 away from 3570, we end up with 286.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2860, and continue the process.

Step 12:
If we divide 2860 by 821, we get 3 and a remainder of 397.
Record the quotient 3 as the next digit in the result. 
Result so far: 52410.8343
The remainder is 397 after subtracting 2463 from 2860.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3970, and continue the process.

On to step 13:
3970 divided by 821 is 4 with a remainder of 686.
Write down 4 as next digit of the result. 
Result so far: 52410.83434
Deduct 3284 from 3970 and we're left with 686.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6860, and continue the process.

On to step 14:
6860 divided by 821 is 8 with a remainder of 292.
Write down 8 as next digit of the result. 
Result so far: 52410.834348
Deduct 6568 from 6860 and we're left with 292.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2920, and continue the process.

Going ahead to step 15:
The number 821 fits into 2920 3 times, leaving a remainder of 457.
Use 3 as the next digit of our solution. 
Result so far: 52410.8343483
If we take 2463 away from 2920, we end up 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.

On to step 16:
The number 821 fits into 4570 5 times, leaving a remainder of 465.
Record the quotient 5 as the next digit in the result. 
Result so far: 52410.83434835
Deduct 4105 from 4570 and we're left with 465.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4650, and continue the process.

The final outcome is 52410.83434835, with a leftover of 4.65e-07.