Let's divide 957872 by 21
We want to figure out the number of times 957872 can be divided by 21.

On to step 1:
The number 21 fits into 9 0 times, leaving a remainder of 9.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 9 after subtracting 0 from 9.
Include the next digit (5) from the dividend after 9, then repeat: 95 / 21

Advancing to step 2:
95 divided by 21 is 4 with a remainder of 11.
The number 4 becomes the next digit in our result. 
Result so far: 4.0
Subtract 84 from 95 to get 11.
Bring next digit (7) of the dividend behind the 11 and repeat the process: 117 / 21

Moving on to step 3:
21 can be fit into 117 5 times, resulting in a remainder of 12.
The next digit of our result is 5. 
Result so far: 45.0
The remainder is 12 after subtracting 105 from 117.
Include the next digit (8) from the dividend after 12, then repeat: 128 / 21

Advancing to step 4:
When dividing 128 by 21, we get 6 with a remainder of 2.
Put 6 as the next digit of the answer. 
Result so far: 456.0
Deduct 126 from 128 and we're left with 2.
Take the next digit (7) from the dividend and append it to 2, then repeat: 27 / 21

Going ahead to step 5:
If we divide 27 by 21, we get 1 and a remainder of 6.
The next digit of our result is 1. 
Result so far: 4561.0
Subtracting 21 from 27 leaves us with 6.
Append the next digit (2) from the dividend to 6 and continue with: 62 / 21

Advancing to step 6:
21 goes into 62 2 times with a remainder of 20.
Record the quotient 2 as the next digit in the result. 
Result so far: 45612.0
Deduct 42 from 62 and we're left with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Advancing to step 7:
The number 21 fits into 200 9 times, leaving a remainder of 11.
Write down 9 as next digit of the result. 
Result so far: 45612.9
If we take 189 away from 200, we end up with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Going ahead to step 8:
If we divide 110 by 21, we get 5 and a remainder of 5.
Use 5 as the next digit of our solution. 
Result so far: 45612.95
If we subtract 105 from 110, we get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Moving on to step 9:
If we divide 50 by 21, we get 2 and a remainder of 8.
Use 2 as the next digit of our solution. 
Result so far: 45612.952
If we take 42 away from 50, we end up with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Moving on to step 10:
80 divided by 21 is 3 with a remainder of 17.
The number 3 becomes the next digit in our result. 
Result so far: 45612.9523
Subtract 63 from 80 to get 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Moving on to step 11:
170 divided by 21 is 8 with a remainder of 2.
The next digit of our result is 8. 
Result so far: 45612.95238
If we subtract 168 from 170, we get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Let's proceed to step 12:
When dividing 20 by 21, we get 0 with a remainder of 20.
The next digit of our result is 0. 
Result so far: 45612.95238
Subtracting 0 from 20 leaves us with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Step 13:
21 goes into 200 9 times with a remainder of 11.
Record the quotient 9 as the next digit in the result. 
Result so far: 45612.9523809
If we take 189 away from 200, we end up with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

Let's proceed to step 14:
21 can be fit into 110 5 times, resulting in a remainder of 5.
Record the quotient 5 as the next digit in the result. 
Result so far: 45612.95238095
If we subtract 105 from 110, we get 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

The quotient of the division is 45612.95238095, and the remainder is 5e-09.