We're dividing 378921 by 84 
Our goal is to divide 378921 by 84.

Moving on to step 1:
84 goes into 3 0 times with a remainder of 3.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 3 after subtracting 0 from 3.
Grab the next digit (7) from the dividend, add it to 3, then carry on: 37 / 84

Going ahead to step 2:
The number 84 fits into 37 0 times, leaving a remainder of 37.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 37, we end up with 37.
Append the next digit (8) from the dividend to 37 and continue with: 378 / 84

Advancing to step 3:
378 divided by 84 is 4 with a remainder of 42.
The next digit of our result is 4. 
Result so far: 4.0
Subtracting 336 from 378 leaves us with 42.
Include the next digit (9) from the dividend after 42, then repeat: 429 / 84

Going ahead to step 4:
429 divided by 84 is 5 with a remainder of 9.
Use 5 as the next digit of our solution. 
Result so far: 45.0
The remainder is 9 after subtracting 420 from 429.
Bring next digit (2) of the dividend behind the 9 and repeat the process: 92 / 84

Going ahead to step 5:
If we divide 92 by 84, we get 1 and a remainder of 8.
Record the quotient 1 as the next digit in the result. 
Result so far: 451.0
The remainder is 8 after subtracting 84 from 92.
Fetch the next digit (1) from the dividend, attach it to 8 and continue: 81 / 84

Going ahead to step 6:
When dividing 81 by 84, we get 0 with a remainder of 81.
The next digit of our result is 0. 
Result so far: 4510.0
Subtracting 0 from 81 leaves us with 81.
Since there are no more digits in the dividend, we add a zero to the remainder making it 810, and continue the process.

Advancing to step 7:
84 goes into 810 9 times with a remainder of 54.
Record the quotient 9 as the next digit in the result. 
Result so far: 4510.9
Subtract 756 from 810 to get 54.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

Advancing to step 8:
84 goes into 540 6 times with a remainder of 36.
The number 6 becomes the next digit in our result. 
Result so far: 4510.96
The remainder is 36 after subtracting 504 from 540.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

On to step 9:
84 can be fit into 360 4 times, resulting in a remainder of 24.
Record the quotient 4 as the next digit in the result. 
Result so far: 4510.964
Deduct 336 from 360 and we're left with 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

On to step 10:
84 can be fit into 240 2 times, resulting in a remainder of 72.
Use 2 as the next digit of our solution. 
Result so far: 4510.9642
Subtract 168 from 240 to get 72.
Since there are no more digits in the dividend, we add a zero to the remainder making it 720, and continue the process.

Step 11:
If we divide 720 by 84, we get 8 and a remainder of 48.
Use 8 as the next digit of our solution. 
Result so far: 4510.96428
Subtract 672 from 720 to get 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

Step 12:
480 divided by 84 is 5 with a remainder of 60.
Record the quotient 5 as the next digit in the result. 
Result so far: 4510.964285
The remainder is 60 after subtracting 420 from 480.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Moving on to step 13:
When dividing 600 by 84, we get 7 with a remainder of 12.
Put 7 as the next digit of the answer. 
Result so far: 4510.9642857
Subtract 588 from 600 to get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Step 14:
If we divide 120 by 84, we get 1 and a remainder of 36.
Use 1 as the next digit of our solution. 
Result so far: 4510.96428571
The remainder is 36 after subtracting 84 from 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

The final result is 4510.96428571 with a remainder of 3.6e-08.