Let's divide 972843 by 21
We want to figure out the number of times 972843 can be divided by 21.

Advancing to step 1:
If we divide 9 by 21, we get 0 and a remainder of 9.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 9, we get 9.
Bring next digit (7) of the dividend behind the 9 and repeat the process: 97 / 21

On to step 2:
21 goes into 97 4 times with a remainder of 13.
Use 4 as the next digit of our solution. 
Result so far: 4.0
If we take 84 away from 97, we end up with 13.
Include the next digit (2) from the dividend after 13, then repeat: 132 / 21

Going ahead to step 3:
The number 21 fits into 132 6 times, leaving a remainder of 6.
Write down 6 as next digit of the result. 
Result so far: 46.0
Subtracting 126 from 132 leaves us with 6.
Bring next digit (8) of the dividend behind the 6 and repeat the process: 68 / 21

Step 4:
21 goes into 68 3 times with a remainder of 5.
Write down 3 as next digit of the result. 
Result so far: 463.0
If we subtract 63 from 68, we get 5.
Grab the next digit (4) from the dividend, add it to 5, then carry on: 54 / 21

Advancing to step 5:
The number 21 fits into 54 2 times, leaving a remainder of 12.
The next digit of our result is 2. 
Result so far: 4632.0
If we take 42 away from 54, we end up with 12.
Fetch the next digit (3) from the dividend, attach it to 12 and continue: 123 / 21

Advancing to step 6:
123 divided by 21 is 5 with a remainder of 18.
Write down 5 as next digit of the result. 
Result so far: 46325.0
The remainder is 18 after subtracting 105 from 123.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Step 7:
180 divided by 21 is 8 with a remainder of 12.
Use 8 as the next digit of our solution. 
Result so far: 46325.8
Subtract 168 from 180 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 8:
21 can be fit into 120 5 times, resulting in a remainder of 15.
Put 5 as the next digit of the answer. 
Result so far: 46325.85
Subtracting 105 from 120 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.

Moving on to step 9:
150 divided by 21 is 7 with a remainder of 3.
Write down 7 as next digit of the result. 
Result so far: 46325.857
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.

Advancing to step 10:
If we divide 30 by 21, we get 1 and a remainder of 9.
Put 1 as the next digit of the answer. 
Result so far: 46325.8571
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.

Going ahead to step 11:
If we divide 90 by 21, we get 4 and a remainder of 6.
The next digit of our result is 4. 
Result so far: 46325.85714
Deduct 84 from 90 and we're left with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Moving on to step 12:
60 divided by 21 is 2 with a remainder of 18.
The number 2 becomes the next digit in our result. 
Result so far: 46325.857142
If we take 42 away from 60, we end up 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.

Going ahead to step 13:
21 can be fit into 180 8 times, resulting in a remainder of 12.
Write down 8 as next digit of the result. 
Result so far: 46325.8571428
If we subtract 168 from 180, we 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.

Advancing to step 14:
120 divided by 21 is 5 with a remainder of 15.
Write down 5 as next digit of the result. 
Result so far: 46325.85714285
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.

After the division, we end up with 46325.85714285 and a remainder of 1.5e-08.