Let's divide 81064064 by 21
We want to divide 81064064 by 21.

Let's proceed to step 1:
21 goes into 8 0 times with a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Include the next digit (1) from the dividend after 8, then repeat: 81 / 21

Step 2:
The number 21 fits into 81 3 times, leaving a remainder of 18.
Use 3 as the next digit of our solution. 
Result so far: 3.0
Subtract 63 from 81 to get 18.
Append the next digit (0) from the dividend to 18 and continue with: 180 / 21

Step 3:
21 can be fit into 180 8 times, resulting in a remainder of 12.
The number 8 becomes the next digit in our result. 
Result so far: 38.0
Deduct 168 from 180 and we're left with 12.
Take the next digit (6) from the dividend and append it to 12, then repeat: 126 / 21

Let's proceed to step 4:
If we divide 126 by 21, we get 6 and a remainder of 0.
The next digit of our result is 6. 
Result so far: 386.0
Subtracting 126 from 126 leaves us with 0.
Fetch the next digit (4) from the dividend, attach it to 0 and continue: 4 / 21

Step 5:
21 goes into 4 0 times with a remainder of 4.
Write down 0 as next digit of the result. 
Result so far: 3860.0
The remainder is 4 after subtracting 0 from 4.
Append the next digit (0) from the dividend to 4 and continue with: 40 / 21

On to step 6:
21 goes into 40 1 times with a remainder of 19.
Use 1 as the next digit of our solution. 
Result so far: 38601.0
Deduct 21 from 40 and we're left with 19.
Fetch the next digit (6) from the dividend, attach it to 19 and continue: 196 / 21

Advancing to step 7:
The number 21 fits into 196 9 times, leaving a remainder of 7.
Record the quotient 9 as the next digit in the result. 
Result so far: 386019.0
If we subtract 189 from 196, we get 7.
Bring next digit (4) of the dividend behind the 7 and repeat the process: 74 / 21

On to step 8:
If we divide 74 by 21, we get 3 and a remainder of 11.
Write down 3 as next digit of the result. 
Result so far: 3860193.0
If we subtract 63 from 74, we get 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 9:
When dividing 110 by 21, we get 5 with a remainder of 5.
Put 5 as the next digit of the answer. 
Result so far: 3860193.5
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.

Advancing to step 10:
21 can be fit into 50 2 times, resulting in a remainder of 8.
The next digit of our result is 2. 
Result so far: 3860193.52
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.

Moving on to step 11:
The number 21 fits into 80 3 times, leaving a remainder of 17.
Use 3 as the next digit of our solution. 
Result so far: 3860193.523
Subtracting 63 from 80 leaves us 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.

Advancing to step 12:
If we divide 170 by 21, we get 8 and a remainder of 2.
Put 8 as the next digit of the answer. 
Result so far: 3860193.5238
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.

Advancing to step 13:
20 divided by 21 is 0 with a remainder of 20.
Use 0 as the next digit of our solution. 
Result so far: 3860193.5238
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.

On to step 14:
If we divide 200 by 21, we get 9 and a remainder of 11.
The number 9 becomes the next digit in our result. 
Result so far: 3860193.523809
Subtract 189 from 200 to get 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

On to step 15:
21 goes into 110 5 times with a remainder of 5.
Put 5 as the next digit of the answer. 
Result so far: 3860193.5238095
The remainder is 5 after subtracting 105 from 110.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Advancing to step 16:
21 goes into 50 2 times with a remainder of 8.
The next digit of our result is 2. 
Result so far: 3860193.52380952
If we subtract 42 from 50, we get 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

The quotient of the division is 3860193.52380952, and the remainder is 8e-09.