We divide 121686 by 84
We want to divide 121686 by 84.

On to step 1:
1 divided by 84 is 0 with a remainder of 1.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 1 after subtracting 0 from 1.
Take the next digit (2) from the dividend and append it to 1, then repeat: 12 / 84

Advancing to step 2:
The number 84 fits into 12 0 times, leaving a remainder of 12.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 12 to get 12.
Take the next digit (1) from the dividend and append it to 12, then repeat: 121 / 84

Moving on to step 3:
84 can be fit into 121 1 times, resulting in a remainder of 37.
Put 1 as the next digit of the answer. 
Result so far: 1.0
If we subtract 84 from 121, we get 37.
Fetch the next digit (6) from the dividend, attach it to 37 and continue: 376 / 84

On to step 4:
The number 84 fits into 376 4 times, leaving a remainder of 40.
Record the quotient 4 as the next digit in the result. 
Result so far: 14.0
Subtracting 336 from 376 leaves us with 40.
Fetch the next digit (8) from the dividend, attach it to 40 and continue: 408 / 84

Step 5:
When dividing 408 by 84, we get 4 with a remainder of 72.
The next digit of our result is 4. 
Result so far: 144.0
Subtract 336 from 408 to get 72.
Bring next digit (6) of the dividend behind the 72 and repeat the process: 726 / 84

Step 6:
726 divided by 84 is 8 with a remainder of 54.
The number 8 becomes the next digit in our result. 
Result so far: 1448.0
Subtracting 672 from 726 leaves us with 54.
Since there are no more digits in the dividend, we add a zero to the remainder making it 540, and continue the process.

Step 7:
The number 84 fits into 540 6 times, leaving a remainder of 36.
Put 6 as the next digit of the answer. 
Result so far: 1448.6
Deduct 504 from 540 and we're left with 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Advancing to step 8:
If we divide 360 by 84, we get 4 and a remainder of 24.
Write down 4 as next digit of the result. 
Result so far: 1448.64
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 9:
The number 84 fits into 240 2 times, leaving a remainder of 72.
Use 2 as the next digit of our solution. 
Result so far: 1448.642
If we subtract 168 from 240, we 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.

On to step 10:
84 goes into 720 8 times with a remainder of 48.
The number 8 becomes the next digit in our result. 
Result so far: 1448.6428
Subtracting 672 from 720 leaves us with 48.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

Advancing to step 11:
480 divided by 84 is 5 with a remainder of 60.
The next digit of our result is 5. 
Result so far: 1448.64285
If we take 420 away from 480, we end up with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

On to step 12:
84 can be fit into 600 7 times, resulting in a remainder of 12.
Write down 7 as next digit of the result. 
Result so far: 1448.642857
The remainder is 12 after subtracting 588 from 600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Advancing to step 13:
The number 84 fits into 120 1 times, leaving a remainder of 36.
Record the quotient 1 as the next digit in the result. 
Result so far: 1448.6428571
If we subtract 84 from 120, we get 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Step 14:
84 goes into 360 4 times with a remainder of 24.
Record the quotient 4 as the next digit in the result. 
Result so far: 1448.64285714
The remainder is 24 after subtracting 336 from 360.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Our division results in 1448.64285714 with a remaining 2.4e-08.