21605 ÷ 54 
We're looking to find how many times 54 goes into 21605.

On to step 1:
2 divided by 54 is 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.
Fetch the next digit (1) from the dividend, attach it to 2 and continue: 21 / 54

Advancing to step 2:
If we divide 21 by 54, we get 0 and a remainder of 21.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 21, we end up with 21.
Include the next digit (6) from the dividend after 21, then repeat: 216 / 54

Step 3:
54 goes into 216 4 times with a remainder of 0.
Put 4 as the next digit of the answer. 
Result so far: 4.0
If we subtract 216 from 216, we get 0.
Fetch the next digit (0) from the dividend, attach it to 0 and continue: 0 / 54

Moving on to step 4:
54 can be fit into 0 0 times, resulting in a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 40.0
The remainder is 0 after subtracting 0 from 0.
Append the next digit (5) from the dividend to 0 and continue with: 5 / 54

Moving on to step 5:
54 goes into 5 0 times with a remainder of 5.
Write down 0 as next digit of the result. 
Result so far: 400.0
Deduct 0 from 5 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.

Going ahead to step 6:
When dividing 50 by 54, we get 0 with a remainder of 50.
Use 0 as the next digit of our solution. 
Result so far: 400.0
Subtracting 0 from 50 leaves us with 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Going ahead to step 7:
The number 54 fits into 500 9 times, leaving a remainder of 14.
Use 9 as the next digit of our solution. 
Result so far: 400.09
Subtract 486 from 500 to get 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Going ahead to step 8:
When dividing 140 by 54, we get 2 with a remainder of 32.
Put 2 as the next digit of the answer. 
Result so far: 400.092
Subtracting 108 from 140 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 9:
54 goes into 320 5 times with a remainder of 50.
The next digit of our result is 5. 
Result so far: 400.0925
Subtracting 270 from 320 leaves us with 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

On to step 10:
If we divide 500 by 54, we get 9 and a remainder of 14.
Write down 9 as next digit of the result. 
Result so far: 400.09259
The remainder is 14 after subtracting 486 from 500.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Step 11:
The number 54 fits into 140 2 times, leaving a remainder of 32.
Put 2 as the next digit of the answer. 
Result so far: 400.092592
The remainder is 32 after subtracting 108 from 140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 320, and continue the process.

Advancing to step 12:
54 can be fit into 320 5 times, resulting in a remainder of 50.
Record the quotient 5 as the next digit in the result. 
Result so far: 400.0925925
If we subtract 270 from 320, we get 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Advancing to step 13:
The number 54 fits into 500 9 times, leaving a remainder of 14.
Use 9 as the next digit of our solution. 
Result so far: 400.09259259
The remainder is 14 after subtracting 486 from 500.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

The final outcome is 400.09259259, with a leftover of 1.4e-08.