We divide 388596 by 3
The aim is to understand the frequency of 3 in 388596.

Step 1:
If we divide 3 by 3, we get 1 and a remainder of 0.
Put 1 as the next digit of the answer. 
Result so far: 1.0
If we take 3 away from 3, we end up with 0.
Include the next digit (8) from the dividend after 0, then repeat: 8 / 3

Moving on to step 2:
The number 3 fits into 8 2 times, leaving a remainder of 2.
The number 2 becomes the next digit in our result. 
Result so far: 12.0
Deduct 6 from 8 and we're left with 2.
Grab the next digit (8) from the dividend, add it to 2, then carry on: 28 / 3

Moving on to step 3:
3 can be fit into 28 9 times, resulting in a remainder of 1.
The number 9 becomes the next digit in our result. 
Result so far: 129.0
If we take 27 away from 28, we end up with 1.
Take the next digit (5) from the dividend and append it to 1, then repeat: 15 / 3

On to step 4:
3 goes into 15 5 times with a remainder of 0.
Put 5 as the next digit of the answer. 
Result so far: 1295.0
Deduct 15 from 15 and we're left with 0.
Append the next digit (9) from the dividend to 0 and continue with: 9 / 3

Step 5:
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: 12953.0
If we subtract 9 from 9, we get 0.
Fetch the next digit (6) from the dividend, attach it to 0 and continue: 6 / 3

Advancing to step 6:
6 divided by 3 is 2 with a remainder of 0.
The number 2 becomes the next digit in our result. 
Result so far: 129532.0
If we subtract 6 from 6, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 7:
3 can be fit into 0 0 times, resulting in a remainder of 0.
Write down 0 as next digit of the result. 
Result so far: 129532.0
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: 129532.0
If we subtract 0 from 0, we get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

The final outcome is 129532.0, with a leftover of 0.0.