We divide 917851 by 3
The aim is to understand the frequency of 3 in 917851.

Moving on to step 1:
If we divide 9 by 3, we get 3 and a remainder of 0.
The number 3 becomes the next digit in our result. 
Result so far: 3.0
If we take 9 away from 9, we end up with 0.
Bring next digit (1) of the dividend behind the 0 and repeat the process: 1 / 3

Let's proceed to step 2:
1 divided by 3 is 0 with a remainder of 1.
Put 0 as the next digit of the answer. 
Result so far: 30.0
The remainder is 1 after subtracting 0 from 1.
Append the next digit (7) from the dividend to 1 and continue with: 17 / 3

Advancing to step 3:
17 divided by 3 is 5 with a remainder of 2.
Write down 5 as next digit of the result. 
Result so far: 305.0
Subtracting 15 from 17 leaves us with 2.
Append the next digit (8) from the dividend to 2 and continue with: 28 / 3

Moving on to step 4:
3 goes into 28 9 times with a remainder of 1.
The next digit of our result is 9. 
Result so far: 3059.0
If we take 27 away from 28, we end up with 1.
Grab the next digit (5) from the dividend, add it to 1, then carry on: 15 / 3

Moving on to step 5:
The number 3 fits into 15 5 times, leaving a remainder of 0.
The number 5 becomes the next digit in our result. 
Result so far: 30595.0
If we subtract 15 from 15, we get 0.
Include the next digit (1) from the dividend after 0, then repeat: 1 / 3

Step 6:
The number 3 fits into 1 0 times, leaving a remainder of 1.
Use 0 as the next digit of our solution. 
Result so far: 305950.0
Deduct 0 from 1 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.

Going ahead to step 7:
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: 305950.3
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.

On to step 8:
3 goes into 10 3 times with a remainder of 1.
Write down 3 as next digit of the result. 
Result so far: 305950.33
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.

The quotient of the division is 305950.33, and the remainder is 0.001.