213102 divided by 28 
The aim is to understand the frequency of 28 in 213102.

Moving on to step 1:
When dividing 2 by 28, we get 0 with a remainder of 2.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 2 leaves us with 2.
Append the next digit (1) from the dividend to 2 and continue with: 21 / 28

Step 2:
The number 28 fits into 21 0 times, leaving a remainder of 21.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 21 and we're left with 21.
Include the next digit (3) from the dividend after 21, then repeat: 213 / 28

Moving on to step 3:
The number 28 fits into 213 7 times, leaving a remainder of 17.
Use 7 as the next digit of our solution. 
Result so far: 7.0
Subtracting 196 from 213 leaves us with 17.
Append the next digit (1) from the dividend to 17 and continue with: 171 / 28

Going ahead to step 4:
171 divided by 28 is 6 with a remainder of 3.
The next digit of our result is 6. 
Result so far: 76.0
If we take 168 away from 171, we end up with 3.
Fetch the next digit (0) from the dividend, attach it to 3 and continue: 30 / 28

On to step 5:
The number 28 fits into 30 1 times, leaving a remainder of 2.
The next digit of our result is 1. 
Result so far: 761.0
The remainder is 2 after subtracting 28 from 30.
Include the next digit (2) from the dividend after 2, then repeat: 22 / 28

Advancing to step 6:
If we divide 22 by 28, we get 0 and a remainder of 22.
Use 0 as the next digit of our solution. 
Result so far: 7610.0
If we take 0 away from 22, we end up with 22.
Since there are no more digits in the dividend, we add a zero to the remainder making it 220, and continue the process.

Let's proceed to step 7:
If we divide 220 by 28, we get 7 and a remainder of 24.
Use 7 as the next digit of our solution. 
Result so far: 7610.7
If we subtract 196 from 220, we 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.

On to step 8:
240 divided by 28 is 8 with a remainder of 16.
Record the quotient 8 as the next digit in the result. 
Result so far: 7610.78
Subtract 224 from 240 to get 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Going ahead to step 9:
If we divide 160 by 28, we get 5 and a remainder of 20.
Use 5 as the next digit of our solution. 
Result so far: 7610.785
Deduct 140 from 160 and we're left with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

On to step 10:
200 divided by 28 is 7 with a remainder of 4.
Put 7 as the next digit of the answer. 
Result so far: 7610.7857
Subtract 196 from 200 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.

Moving on to step 11:
The number 28 fits into 40 1 times, leaving a remainder of 12.
Write down 1 as next digit of the result. 
Result so far: 7610.78571
Subtracting 28 from 40 leaves us with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Going ahead to step 12:
The number 28 fits into 120 4 times, leaving a remainder of 8.
Use 4 as the next digit of our solution. 
Result so far: 7610.785714
The remainder is 8 after subtracting 112 from 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Going ahead to step 13:
28 goes into 80 2 times with a remainder of 24.
Use 2 as the next digit of our solution. 
Result so far: 7610.7857142
Subtracting 56 from 80 leaves us with 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Going ahead to step 14:
28 goes into 240 8 times with a remainder of 16.
Put 8 as the next digit of the answer. 
Result so far: 7610.78571428
Subtract 224 from 240 to get 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Our division results in 7610.78571428 with a remaining 1.6e-08.