970521 ÷ 3 
The aim is to understand the frequency of 3 in 970521.

Moving on to step 1:
When dividing 9 by 3, we get 3 with a remainder of 0.
Write down 3 as next digit of the result. 
Result so far: 3.0
The remainder is 0 after subtracting 9 from 9.
Fetch the next digit (7) from the dividend, attach it to 0 and continue: 7 / 3

On to step 2:
3 can be fit into 7 2 times, resulting in a remainder of 1.
The number 2 becomes the next digit in our result. 
Result so far: 32.0
The remainder is 1 after subtracting 6 from 7.
Take the next digit (0) from the dividend and append it to 1, then repeat: 10 / 3

Advancing to step 3:
When dividing 10 by 3, we get 3 with a remainder of 1.
Write down 3 as next digit of the result. 
Result so far: 323.0
The remainder is 1 after subtracting 9 from 10.
Fetch the next digit (5) from the dividend, attach it to 1 and continue: 15 / 3

Going ahead to step 4:
3 goes into 15 5 times with a remainder of 0.
The number 5 becomes the next digit in our result. 
Result so far: 3235.0
Subtract 15 from 15 to get 0.
Take the next digit (2) from the dividend and append it to 0, then repeat: 2 / 3

Let's proceed to step 5:
3 can be fit into 2 0 times, resulting in a remainder of 2.
Use 0 as the next digit of our solution. 
Result so far: 32350.0
If we take 0 away from 2, we end up with 2.
Fetch the next digit (1) from the dividend, attach it to 2 and continue: 21 / 3

On to step 6:
3 goes into 21 7 times with a remainder of 0.
Write down 7 as next digit of the result. 
Result so far: 323507.0
Deduct 21 from 21 and we're left with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Moving on to step 7:
If we divide 0 by 3, we get 0 and a remainder of 0.
The next digit of our result is 0. 
Result so far: 323507.0
If we take 0 away from 0, we end up with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Moving on to step 8:
0 divided by 3 is 0 with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 323507.0
Subtracting 0 from 0 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Our division results in 323507.0 with a remaining 0.0.