Let's divide 964088 by 21
Our goal is to divide 964088 by 21.

On to step 1:
The number 21 fits into 9 0 times, leaving a remainder of 9.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 9, we end up with 9.
Bring next digit (6) of the dividend behind the 9 and repeat the process: 96 / 21

Let's proceed to step 2:
When dividing 96 by 21, we get 4 with a remainder of 12.
Write down 4 as next digit of the result. 
Result so far: 4.0
Subtracting 84 from 96 leaves us with 12.
Append the next digit (4) from the dividend to 12 and continue with: 124 / 21

Going ahead to step 3:
21 goes into 124 5 times with a remainder of 19.
The number 5 becomes the next digit in our result. 
Result so far: 45.0
Subtract 105 from 124 to get 19.
Append the next digit (0) from the dividend to 19 and continue with: 190 / 21

Advancing to step 4:
190 divided by 21 is 9 with a remainder of 1.
The number 9 becomes the next digit in our result. 
Result so far: 459.0
Deduct 189 from 190 and we're left with 1.
Take the next digit (8) from the dividend and append it to 1, then repeat: 18 / 21

Step 5:
21 goes into 18 0 times with a remainder of 18.
Record the quotient 0 as the next digit in the result. 
Result so far: 4590.0
If we subtract 0 from 18, we get 18.
Append the next digit (8) from the dividend to 18 and continue with: 188 / 21

Going ahead to step 6:
If we divide 188 by 21, we get 8 and a remainder of 20.
The number 8 becomes the next digit in our result. 
Result so far: 45908.0
If we subtract 168 from 188, we get 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 7:
21 can be fit into 200 9 times, resulting in a remainder of 11.
Record the quotient 9 as the next digit in the result. 
Result so far: 45908.9
Deduct 189 from 200 and we're left 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 8:
When dividing 110 by 21, we get 5 with a remainder of 5.
Record the quotient 5 as the next digit in the result. 
Result so far: 45908.95
Deduct 105 from 110 and we're left with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

On to step 9:
If we divide 50 by 21, we get 2 and a remainder of 8.
The next digit of our result is 2. 
Result so far: 45908.952
The remainder is 8 after subtracting 42 from 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Going ahead to step 10:
80 divided by 21 is 3 with a remainder of 17.
Record the quotient 3 as the next digit in the result. 
Result so far: 45908.9523
Deduct 63 from 80 and we're left with 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

On to step 11:
If we divide 170 by 21, we get 8 and a remainder of 2.
Write down 8 as next digit of the result. 
Result so far: 45908.95238
Subtract 168 from 170 to 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.

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: 45908.95238
If we take 0 away from 20, we end up 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.

Going ahead to step 13:
The number 21 fits into 200 9 times, leaving a remainder of 11.
Put 9 as the next digit of the answer. 
Result so far: 45908.9523809
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.

Step 14:
When dividing 110 by 21, we get 5 with a remainder of 5.
Use 5 as the next digit of our solution. 
Result so far: 45908.95238095
Subtract 105 from 110 to 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 final outcome is 45908.95238095, with a leftover of 5e-09.