We look at the division of 28216457 by 820 
The aim is to understand the frequency of 820 in 28216457.

Let's proceed to step 1:
If we divide 2 by 820, we get 0 and a remainder of 2.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 2 leaves us with 2.
Include the next digit (8) from the dividend after 2, then repeat: 28 / 820

Let's proceed to step 2:
28 divided by 820 is 0 with a remainder of 28.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 28, we end up with 28.
Bring next digit (2) of the dividend behind the 28 and repeat the process: 282 / 820

Advancing to step 3:
282 divided by 820 is 0 with a remainder of 282.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 282, we end up with 282.
Bring next digit (1) of the dividend behind the 282 and repeat the process: 2821 / 820

Going ahead to step 4:
820 can be fit into 2821 3 times, resulting in a remainder of 361.
Write down 3 as next digit of the result. 
Result so far: 3.0
Subtracting 2460 from 2821 leaves us with 361.
Append the next digit (6) from the dividend to 361 and continue with: 3616 / 820

On to step 5:
When dividing 3616 by 820, we get 4 with a remainder of 336.
The number 4 becomes the next digit in our result. 
Result so far: 34.0
Subtract 3280 from 3616 to get 336.
Fetch the next digit (4) from the dividend, attach it to 336 and continue: 3364 / 820

Let's proceed to step 6:
The number 820 fits into 3364 4 times, leaving a remainder of 84.
Put 4 as the next digit of the answer. 
Result so far: 344.0
Subtract 3280 from 3364 to get 84.
Take the next digit (5) from the dividend and append it to 84, then repeat: 845 / 820

Going ahead to step 7:
When dividing 845 by 820, we get 1 with a remainder of 25.
The next digit of our result is 1. 
Result so far: 3441.0
Subtract 820 from 845 to get 25.
Include the next digit (7) from the dividend after 25, then repeat: 257 / 820

On to step 8:
820 goes into 257 0 times with a remainder of 257.
Use 0 as the next digit of our solution. 
Result so far: 34410.0
Subtracting 0 from 257 leaves us with 257.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2570, and continue the process.

Advancing to step 9:
820 can be fit into 2570 3 times, resulting in a remainder of 110.
Put 3 as the next digit of the answer. 
Result so far: 34410.3
If we take 2460 away from 2570, we end up 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.

Moving on to step 10:
820 can be fit into 1100 1 times, resulting in a remainder of 280.
Put 1 as the next digit of the answer. 
Result so far: 34410.31
If we take 820 away from 1100, we end up with 280.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2800, and continue the process.

On to step 11:
820 can be fit into 2800 3 times, resulting in a remainder of 340.
Use 3 as the next digit of our solution. 
Result so far: 34410.313
If we take 2460 away from 2800, we end up with 340.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3400, and continue the process.

Step 12:
When dividing 3400 by 820, we get 4 with a remainder of 120.
Put 4 as the next digit of the answer. 
Result so far: 34410.3134
Subtract 3280 from 3400 to get 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1200, and continue the process.

Moving on to step 13:
1200 divided by 820 is 1 with a remainder of 380.
Put 1 as the next digit of the answer. 
Result so far: 34410.31341
Subtract 820 from 1200 to get 380.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3800, and continue the process.

Advancing to step 14:
If we divide 3800 by 820, we get 4 and a remainder of 520.
The next digit of our result is 4. 
Result so far: 34410.313414
If we subtract 3280 from 3800, we get 520.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5200, and continue the process.

Advancing to step 15:
If we divide 5200 by 820, we get 6 and a remainder of 280.
The next digit of our result is 6. 
Result so far: 34410.3134146
Deduct 4920 from 5200 and we're left with 280.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2800, and continue the process.

Moving on to step 16:
The number 820 fits into 2800 3 times, leaving a remainder of 340.
Write down 3 as next digit of the result. 
Result so far: 34410.31341463
If we take 2460 away from 2800, we end up with 340.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3400, and continue the process.

The final outcome is 34410.31341463, with a leftover of 3.4e-07.