Let's divide 509866 by 84
We're looking to find how many times 84 goes into 509866.

Let's proceed to step 1:
84 can be fit into 5 0 times, resulting in a remainder of 5.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 5 and we're left with 5.
Append the next digit (0) from the dividend to 5 and continue with: 50 / 84

Advancing to step 2:
If we divide 50 by 84, we get 0 and a remainder of 50.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 50 and we're left with 50.
Include the next digit (9) from the dividend after 50, then repeat: 509 / 84

Going ahead to step 3:
When dividing 509 by 84, we get 6 with a remainder of 5.
Put 6 as the next digit of the answer. 
Result so far: 6.0
If we subtract 504 from 509, we get 5.
Append the next digit (8) from the dividend to 5 and continue with: 58 / 84

Advancing to step 4:
84 can be fit into 58 0 times, resulting in a remainder of 58.
The next digit of our result is 0. 
Result so far: 60.0
If we take 0 away from 58, we end up with 58.
Grab the next digit (6) from the dividend, add it to 58, then carry on: 586 / 84

Step 5:
If we divide 586 by 84, we get 6 and a remainder of 82.
Write down 6 as next digit of the result. 
Result so far: 606.0
Subtract 504 from 586 to get 82.
Take the next digit (6) from the dividend and append it to 82, then repeat: 826 / 84

Moving on to step 6:
84 can be fit into 826 9 times, resulting in a remainder of 70.
Record the quotient 9 as the next digit in the result. 
Result so far: 6069.0
Deduct 756 from 826 and we're left with 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

Step 7:
700 divided by 84 is 8 with a remainder of 28.
Put 8 as the next digit of the answer. 
Result so far: 6069.8
Deduct 672 from 700 and we're left with 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Going ahead to step 8:
280 divided by 84 is 3 with a remainder of 28.
Put 3 as the next digit of the answer. 
Result so far: 6069.83
Subtract 252 from 280 to get 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Let's proceed to step 9:
84 can be fit into 280 3 times, resulting in a remainder of 28.
Write down 3 as next digit of the result. 
Result so far: 6069.833
Deduct 252 from 280 and we're left with 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

The quotient of the division is 6069.833, and the remainder is 0.0028.