We look at the division of 874420 by 3 
The aim is to understand the frequency of 3 in 874420.

Step 1:
When dividing 8 by 3, we get 2 with a remainder of 2.
The next digit of our result is 2. 
Result so far: 2.0
If we subtract 6 from 8, we get 2.
Take the next digit (7) from the dividend and append it to 2, then repeat: 27 / 3

On to step 2:
27 divided by 3 is 9 with a remainder of 0.
Use 9 as the next digit of our solution. 
Result so far: 29.0
Deduct 27 from 27 and we're left with 0.
Fetch the next digit (4) from the dividend, attach it to 0 and continue: 4 / 3

Going ahead to step 3:
When dividing 4 by 3, we get 1 with a remainder of 1.
Record the quotient 1 as the next digit in the result. 
Result so far: 291.0
Subtract 3 from 4 to get 1.
Fetch the next digit (4) from the dividend, attach it to 1 and continue: 14 / 3

Advancing to step 4:
14 divided by 3 is 4 with a remainder of 2.
Record the quotient 4 as the next digit in the result. 
Result so far: 2914.0
The remainder is 2 after subtracting 12 from 14.
Bring next digit (2) of the dividend behind the 2 and repeat the process: 22 / 3

Let's proceed to step 5:
When dividing 22 by 3, we get 7 with a remainder of 1.
The next digit of our result is 7. 
Result so far: 29147.0
Subtract 21 from 22 to get 1.
Take the next digit (0) from the dividend and append it to 1, then repeat: 10 / 3

On to step 6:
3 can be fit into 10 3 times, resulting in a remainder of 1.
Record the quotient 3 as the next digit in the result. 
Result so far: 291473.0
If we subtract 9 from 10, we get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Moving on to step 7:
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: 291473.3
If we take 9 away from 10, we end up 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.

Moving on to step 8:
10 divided by 3 is 3 with a remainder of 1.
Record the quotient 3 as the next digit in the result. 
Result so far: 291473.33
Subtracting 9 from 10 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.

Our division results in 291473.33 with a remaining 0.001.