We divide 78421 by 84
We're looking to find how many times 84 goes into 78421.

On to step 1:
84 can be fit into 7 0 times, resulting in a remainder of 7.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 7 after subtracting 0 from 7.
Fetch the next digit (8) from the dividend, attach it to 7 and continue: 78 / 84

Let's proceed to step 2:
84 can be fit into 78 0 times, resulting in a remainder of 78.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 78 and we're left with 78.
Include the next digit (4) from the dividend after 78, then repeat: 784 / 84

Step 3:
84 goes into 784 9 times with a remainder of 28.
The next digit of our result is 9. 
Result so far: 9.0
The remainder is 28 after subtracting 756 from 784.
Append the next digit (2) from the dividend to 28 and continue with: 282 / 84

Let's proceed to step 4:
282 divided by 84 is 3 with a remainder of 30.
Write down 3 as next digit of the result. 
Result so far: 93.0
If we subtract 252 from 282, we get 30.
Bring next digit (1) of the dividend behind the 30 and repeat the process: 301 / 84

Let's proceed to step 5:
The number 84 fits into 301 3 times, leaving a remainder of 49.
The next digit of our result is 3. 
Result so far: 933.0
Subtract 252 from 301 to get 49.
Since there are no more digits in the dividend, we add a zero to the remainder making it 490, and continue the process.

Moving on to step 6:
84 can be fit into 490 5 times, resulting in a remainder of 70.
The next digit of our result is 5. 
Result so far: 933.5
Deduct 420 from 490 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.

On to step 7:
The number 84 fits into 700 8 times, leaving a remainder of 28.
Use 8 as the next digit of our solution. 
Result so far: 933.58
Subtract 672 from 700 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 8:
84 goes into 280 3 times with a remainder of 28.
The number 3 becomes the next digit in our result. 
Result so far: 933.583
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.

Advancing to step 9:
The number 84 fits into 280 3 times, leaving a remainder of 28.
Use 3 as the next digit of our solution. 
Result so far: 933.5833
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.

After the division, we end up with 933.5833 and a remainder of 0.00028.