778820 divided by 3 
The aim is to understand the frequency of 3 in 778820.

On to step 1:
3 can be fit into 7 2 times, resulting in a remainder of 1.
Put 2 as the next digit of the answer. 
Result so far: 2.0
If we take 6 away from 7, we end up with 1.
Grab the next digit (7) from the dividend, add it to 1, then carry on: 17 / 3

On to step 2:
The number 3 fits into 17 5 times, leaving a remainder of 2.
The number 5 becomes the next digit in our result. 
Result so far: 25.0
Subtracting 15 from 17 leaves us with 2.
Grab the next digit (8) from the dividend, add it to 2, then carry on: 28 / 3

Let's proceed to step 3:
3 goes into 28 9 times with a remainder of 1.
Use 9 as the next digit of our solution. 
Result so far: 259.0
Subtract 27 from 28 to get 1.
Grab the next digit (8) from the dividend, add it to 1, then carry on: 18 / 3

Going ahead to step 4:
18 divided by 3 is 6 with a remainder of 0.
Record the quotient 6 as the next digit in the result. 
Result so far: 2596.0
Deduct 18 from 18 and we're left with 0.
Fetch the next digit (2) from the dividend, attach it to 0 and continue: 2 / 3

Advancing to step 5:
2 divided by 3 is 0 with a remainder of 2.
Use 0 as the next digit of our solution. 
Result so far: 25960.0
Subtract 0 from 2 to get 2.
Bring next digit (0) of the dividend behind the 2 and repeat the process: 20 / 3

Going ahead to step 6:
3 can be fit into 20 6 times, resulting in a remainder of 2.
Use 6 as the next digit of our solution. 
Result so far: 259606.0
If we subtract 18 from 20, we get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

On to step 7:
3 goes into 20 6 times with a remainder of 2.
The number 6 becomes the next digit in our result. 
Result so far: 259606.6
If we take 18 away from 20, we end up with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Step 8:
3 can be fit into 20 6 times, resulting in a remainder of 2.
The number 6 becomes the next digit in our result. 
Result so far: 259606.66
Subtract 18 from 20 to get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

The final result is 259606.66 with a remainder of 0.002.