We look at the division of 81027421 by 228 
The aim is to understand the frequency of 228 in 81027421.

Let's proceed to step 1:
If we divide 8 by 228, we get 0 and a remainder of 8.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we take 0 away from 8, we end up with 8.
Append the next digit (1) from the dividend to 8 and continue with: 81 / 228

Going ahead to step 2:
81 divided by 228 is 0 with a remainder of 81.
Use 0 as the next digit of our solution. 
Result so far: 0.0
If we subtract 0 from 81, we get 81.
Grab the next digit (0) from the dividend, add it to 81, then carry on: 810 / 228

Going ahead to step 3:
The number 228 fits into 810 3 times, leaving a remainder of 126.
Record the quotient 3 as the next digit in the result. 
Result so far: 3.0
Deduct 684 from 810 and we're left with 126.
Fetch the next digit (2) from the dividend, attach it to 126 and continue: 1262 / 228

On to step 4:
When dividing 1262 by 228, we get 5 with a remainder of 122.
Write down 5 as next digit of the result. 
Result so far: 35.0
Subtract 1140 from 1262 to get 122.
Bring next digit (7) of the dividend behind the 122 and repeat the process: 1227 / 228

Advancing to step 5:
If we divide 1227 by 228, we get 5 and a remainder of 87.
Put 5 as the next digit of the answer. 
Result so far: 355.0
Subtracting 1140 from 1227 leaves us with 87.
Fetch the next digit (4) from the dividend, attach it to 87 and continue: 874 / 228

Moving on to step 6:
228 goes into 874 3 times with a remainder of 190.
Record the quotient 3 as the next digit in the result. 
Result so far: 3553.0
The remainder is 190 after subtracting 684 from 874.
Include the next digit (2) from the dividend after 190, then repeat: 1902 / 228

On to step 7:
228 can be fit into 1902 8 times, resulting in a remainder of 78.
The next digit of our result is 8. 
Result so far: 35538.0
Subtracting 1824 from 1902 leaves us with 78.
Fetch the next digit (1) from the dividend, attach it to 78 and continue: 781 / 228

On to step 8:
If we divide 781 by 228, we get 3 and a remainder of 97.
Put 3 as the next digit of the answer. 
Result so far: 355383.0
If we take 684 away from 781, we end up with 97.
Since there are no more digits in the dividend, we add a zero to the remainder making it 970, and continue the process.

Going ahead to step 9:
228 goes into 970 4 times with a remainder of 58.
The next digit of our result is 4. 
Result so far: 355383.4
Subtracting 912 from 970 leaves us with 58.
Since there are no more digits in the dividend, we add a zero to the remainder making it 580, and continue the process.

Moving on to step 10:
580 divided by 228 is 2 with a remainder of 124.
Record the quotient 2 as the next digit in the result. 
Result so far: 355383.42
Subtracting 456 from 580 leaves us with 124.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1240, and continue the process.

Step 11:
When dividing 1240 by 228, we get 5 with a remainder of 100.
Put 5 as the next digit of the answer. 
Result so far: 355383.425
Subtracting 1140 from 1240 leaves us with 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1000, and continue the process.

On to step 12:
1000 divided by 228 is 4 with a remainder of 88.
The number 4 becomes the next digit in our result. 
Result so far: 355383.4254
If we take 912 away from 1000, we end up with 88.
Since there are no more digits in the dividend, we add a zero to the remainder making it 880, and continue the process.

Moving on to step 13:
228 goes into 880 3 times with a remainder of 196.
Put 3 as the next digit of the answer. 
Result so far: 355383.42543
Deduct 684 from 880 and we're left with 196.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1960, and continue the process.

Moving on to step 14:
If we divide 1960 by 228, we get 8 and a remainder of 136.
The number 8 becomes the next digit in our result. 
Result so far: 355383.425438
The remainder is 136 after subtracting 1824 from 1960.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1360, and continue the process.

Advancing to step 15:
228 can be fit into 1360 5 times, resulting in a remainder of 220.
The next digit of our result is 5. 
Result so far: 355383.4254385
Deduct 1140 from 1360 and we're left with 220.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2200, and continue the process.

Let's proceed to step 16:
The number 228 fits into 2200 9 times, leaving a remainder of 148.
The number 9 becomes the next digit in our result. 
Result so far: 355383.42543859
Subtract 2052 from 2200 to get 148.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1480, and continue the process.

The final outcome is 355383.42543859, with a leftover of 1.48e-07.