We look at the division of 57644 by 21 
We want to figure out the number of times 57644 can be divided by 21.

Advancing to step 1:
If we divide 5 by 21, we get 0 and a remainder of 5.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtract 0 from 5 to get 5.
Include the next digit (7) from the dividend after 5, then repeat: 57 / 21

On to step 2:
The number 21 fits into 57 2 times, leaving a remainder of 15.
Use 2 as the next digit of our solution. 
Result so far: 2.0
Subtracting 42 from 57 leaves us with 15.
Bring next digit (6) of the dividend behind the 15 and repeat the process: 156 / 21

Step 3:
The number 21 fits into 156 7 times, leaving a remainder of 9.
The next digit of our result is 7. 
Result so far: 27.0
Deduct 147 from 156 and we're left with 9.
Include the next digit (4) from the dividend after 9, then repeat: 94 / 21

Moving on to step 4:
The number 21 fits into 94 4 times, leaving a remainder of 10.
The next digit of our result is 4. 
Result so far: 274.0
If we take 84 away from 94, we end up with 10.
Fetch the next digit (4) from the dividend, attach it to 10 and continue: 104 / 21

Moving on to step 5:
21 can be fit into 104 4 times, resulting in a remainder of 20.
Put 4 as the next digit of the answer. 
Result so far: 2744.0
The remainder is 20 after subtracting 84 from 104.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Moving on to step 6:
21 goes into 200 9 times with a remainder of 11.
Write down 9 as next digit of the result. 
Result so far: 2744.9
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 7:
21 can be fit into 110 5 times, resulting in a remainder of 5.
Put 5 as the next digit of the answer. 
Result so far: 2744.95
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.

Advancing to step 8:
When dividing 50 by 21, we get 2 with a remainder of 8.
Put 2 as the next digit of the answer. 
Result so far: 2744.952
Subtract 42 from 50 to 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.

Advancing to step 9:
The number 21 fits into 80 3 times, leaving a remainder of 17.
The next digit of our result is 3. 
Result so far: 2744.9523
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 10:
The number 21 fits into 170 8 times, leaving a remainder of 2.
Put 8 as the next digit of the answer. 
Result so far: 2744.95238
Subtracting 168 from 170 leaves us with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Going ahead to step 11:
21 goes into 20 0 times with a remainder of 20.
Write down 0 as next digit of the result. 
Result so far: 2744.95238
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.

On to step 12:
When dividing 200 by 21, we get 9 with a remainder of 11.
Use 9 as the next digit of our solution. 
Result so far: 2744.9523809
Subtracting 189 from 200 leaves us 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 13:
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: 2744.95238095
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.

After the division, we end up with 2744.95238095 and a remainder of 5e-09.