Let's divide 87921 by 21
Let's see how many times 21 fits into 87921.

Moving on to step 1:
8 divided by 21 is 0 with a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 8, we end up with 8.
Grab the next digit (7) from the dividend, add it to 8, then carry on: 87 / 21

Step 2:
87 divided by 21 is 4 with a remainder of 3.
Use 4 as the next digit of our solution. 
Result so far: 4.0
Deduct 84 from 87 and we're left with 3.
Take the next digit (9) from the dividend and append it to 3, then repeat: 39 / 21

Step 3:
If we divide 39 by 21, we get 1 and a remainder of 18.
Record the quotient 1 as the next digit in the result. 
Result so far: 41.0
If we subtract 21 from 39, we get 18.
Grab the next digit (2) from the dividend, add it to 18, then carry on: 182 / 21

Advancing to step 4:
When dividing 182 by 21, we get 8 with a remainder of 14.
Write down 8 as next digit of the result. 
Result so far: 418.0
Subtract 168 from 182 to get 14.
Take the next digit (1) from the dividend and append it to 14, then repeat: 141 / 21

On to step 5:
141 divided by 21 is 6 with a remainder of 15.
Put 6 as the next digit of the answer. 
Result so far: 4186.0
Subtracting 126 from 141 leaves us with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Let's proceed to step 6:
When dividing 150 by 21, we get 7 with a remainder of 3.
The next digit of our result is 7. 
Result so far: 4186.7
Subtract 147 from 150 to get 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Moving on to step 7:
21 can be fit into 30 1 times, resulting in a remainder of 9.
The next digit of our result is 1. 
Result so far: 4186.71
If we subtract 21 from 30, we get 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Moving on to step 8:
When dividing 90 by 21, we get 4 with a remainder of 6.
Put 4 as the next digit of the answer. 
Result so far: 4186.714
The remainder is 6 after subtracting 84 from 90.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Advancing to step 9:
The number 21 fits into 60 2 times, leaving a remainder of 18.
Put 2 as the next digit of the answer. 
Result so far: 4186.7142
Subtracting 42 from 60 leaves us with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Moving on to step 10:
21 goes into 180 8 times with a remainder of 12.
Put 8 as the next digit of the answer. 
Result so far: 4186.71428
The remainder is 12 after subtracting 168 from 180.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Going ahead to step 11:
The number 21 fits into 120 5 times, leaving a remainder of 15.
The number 5 becomes the next digit in our result. 
Result so far: 4186.714285
If we subtract 105 from 120, we get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Advancing to step 12:
150 divided by 21 is 7 with a remainder of 3.
Put 7 as the next digit of the answer. 
Result so far: 4186.7142857
Deduct 147 from 150 and we're left with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Advancing to step 13:
When dividing 30 by 21, we get 1 with a remainder of 9.
The next digit of our result is 1. 
Result so far: 4186.71428571
If we subtract 21 from 30, we get 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

The final result is 4186.71428571 with a remainder of 9e-09.