We're dividing 21354560 by 816 
We're looking to find how many times 816 goes into 21354560.

Step 1:
When dividing 2 by 816, we get 0 with a remainder of 2.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 2 to get 2.
Append the next digit (1) from the dividend to 2 and continue with: 21 / 816

Step 2:
21 divided by 816 is 0 with a remainder of 21.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 21 after subtracting 0 from 21.
Include the next digit (3) from the dividend after 21, then repeat: 213 / 816

Let's proceed to step 3:
When dividing 213 by 816, we get 0 with a remainder of 213.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 213 leaves us with 213.
Bring next digit (5) of the dividend behind the 213 and repeat the process: 2135 / 816

Step 4:
2135 divided by 816 is 2 with a remainder of 503.
Write down 2 as next digit of the result. 
Result so far: 2.0
Subtract 1632 from 2135 to get 503.
Bring next digit (4) of the dividend behind the 503 and repeat the process: 5034 / 816

Going ahead to step 5:
If we divide 5034 by 816, we get 6 and a remainder of 138.
Record the quotient 6 as the next digit in the result. 
Result so far: 26.0
The remainder is 138 after subtracting 4896 from 5034.
Include the next digit (5) from the dividend after 138, then repeat: 1385 / 816

Let's proceed to step 6:
When dividing 1385 by 816, we get 1 with a remainder of 569.
Record the quotient 1 as the next digit in the result. 
Result so far: 261.0
The remainder is 569 after subtracting 816 from 1385.
Include the next digit (6) from the dividend after 569, then repeat: 5696 / 816

Going ahead to step 7:
When dividing 5696 by 816, we get 6 with a remainder of 800.
The next digit of our result is 6. 
Result so far: 2616.0
If we take 4896 away from 5696, we end up with 800.
Fetch the next digit (0) from the dividend, attach it to 800 and continue: 8000 / 816

Step 8:
816 goes into 8000 9 times with a remainder of 656.
Use 9 as the next digit of our solution. 
Result so far: 26169.0
If we take 7344 away from 8000, we end up with 656.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6560, and continue the process.

On to step 9:
6560 divided by 816 is 8 with a remainder of 32.
Use 8 as the next digit of our solution. 
Result so far: 26169.8
Subtracting 6528 from 6560 leaves us with 32.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

On to step 10:
When dividing 320 by 816, we get 0 with a remainder of 320.
Put 0 as the next digit of the answer. 
Result so far: 26169.8
Deduct 0 from 320 and we're left with 320.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3200, and continue the process.

On to step 11:
3200 divided by 816 is 3 with a remainder of 752.
Put 3 as the next digit of the answer. 
Result so far: 26169.803
If we take 2448 away from 3200, we end up with 752.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7520, and continue the process.

On to step 12:
When dividing 7520 by 816, we get 9 with a remainder of 176.
The number 9 becomes the next digit in our result. 
Result so far: 26169.8039
If we subtract 7344 from 7520, we get 176.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1760, and continue the process.

Moving on to step 13:
If we divide 1760 by 816, we get 2 and a remainder of 128.
Write down 2 as next digit of the result. 
Result so far: 26169.80392
Subtract 1632 from 1760 to get 128.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1280, and continue the process.

On to step 14:
The number 816 fits into 1280 1 times, leaving a remainder of 464.
The number 1 becomes the next digit in our result. 
Result so far: 26169.803921
If we take 816 away from 1280, we end up with 464.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4640, and continue the process.

Going ahead to step 15:
816 can be fit into 4640 5 times, resulting in a remainder of 560.
The number 5 becomes the next digit in our result. 
Result so far: 26169.8039215
Subtract 4080 from 4640 to get 560.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5600, and continue the process.

Let's proceed to step 16:
If we divide 5600 by 816, we get 6 and a remainder of 704.
Record the quotient 6 as the next digit in the result. 
Result so far: 26169.80392156
Deduct 4896 from 5600 and we're left with 704.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7040, and continue the process.

After the division, we end up with 26169.80392156 and a remainder of 7.04e-07.