We look at the division of 28258 by 3 
The aim is to understand the frequency of 3 in 28258.

On to step 1:
2 divided by 3 is 0 with a remainder of 2.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 2 leaves us with 2.
Take the next digit (8) from the dividend and append it to 2, then repeat: 28 / 3

On to step 2:
When dividing 28 by 3, we get 9 with a remainder of 1.
Write down 9 as next digit of the result. 
Result so far: 9.0
Subtract 27 from 28 to get 1.
Bring next digit (2) of the dividend behind the 1 and repeat the process: 12 / 3

Going ahead to step 3:
3 can be fit into 12 4 times, resulting in a remainder of 0.
Write down 4 as next digit of the result. 
Result so far: 94.0
Subtract 12 from 12 to get 0.
Append the next digit (5) from the dividend to 0 and continue with: 5 / 3

Advancing to step 4:
3 can be fit into 5 1 times, resulting in a remainder of 2.
The number 1 becomes the next digit in our result. 
Result so far: 941.0
Subtract 3 from 5 to get 2.
Bring next digit (8) of the dividend behind the 2 and repeat the process: 28 / 3

Advancing to step 5:
When dividing 28 by 3, we get 9 with a remainder of 1.
Put 9 as the next digit of the answer. 
Result so far: 9419.0
Subtracting 27 from 28 leaves us with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Going ahead to step 6:
When dividing 10 by 3, we get 3 with a remainder of 1.
Use 3 as the next digit of our solution. 
Result so far: 9419.3
Deduct 9 from 10 and we're left with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

On to step 7:
When dividing 10 by 3, we get 3 with a remainder of 1.
Put 3 as the next digit of the answer. 
Result so far: 9419.33
Deduct 9 from 10 and we're left with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Our division results in 9419.33 with a remaining 0.001.