We're dividing 21690 by 53 
We want to figure out the number of times 21690 can be divided by 53.

Let's proceed to step 1:
The number 53 fits into 2 0 times, leaving a remainder of 2.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we subtract 0 from 2, we get 2.
Append the next digit (1) from the dividend to 2 and continue with: 21 / 53

Step 2:
53 goes into 21 0 times with a remainder of 21.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 21 after subtracting 0 from 21.
Include the next digit (6) from the dividend after 21, then repeat: 216 / 53

Moving on to step 3:
When dividing 216 by 53, we get 4 with a remainder of 4.
Use 4 as the next digit of our solution. 
Result so far: 4.0
If we subtract 212 from 216, we get 4.
Append the next digit (9) from the dividend to 4 and continue with: 49 / 53

Going ahead to step 4:
When dividing 49 by 53, we get 0 with a remainder of 49.
The next digit of our result is 0. 
Result so far: 40.0
Deduct 0 from 49 and we're left with 49.
Take the next digit (0) from the dividend and append it to 49, then repeat: 490 / 53

On to step 5:
53 goes into 490 9 times with a remainder of 13.
Record the quotient 9 as the next digit in the result. 
Result so far: 409.0
The remainder is 13 after subtracting 477 from 490.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Let's proceed to step 6:
130 divided by 53 is 2 with a remainder of 24.
Write down 2 as next digit of the result. 
Result so far: 409.2
The remainder is 24 after subtracting 106 from 130.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Moving on to step 7:
The number 53 fits into 240 4 times, leaving a remainder of 28.
The number 4 becomes the next digit in our result. 
Result so far: 409.24
Deduct 212 from 240 and we're left with 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Let's proceed to step 8:
53 goes into 280 5 times with a remainder of 15.
The number 5 becomes the next digit in our result. 
Result so far: 409.245
If we take 265 away from 280, we end up with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Moving on to step 9:
The number 53 fits into 150 2 times, leaving a remainder of 44.
Use 2 as the next digit of our solution. 
Result so far: 409.2452
Subtract 106 from 150 to get 44.
Since there are no more digits in the dividend, we add a zero to the remainder making it 440, and continue the process.

Moving on to step 10:
440 divided by 53 is 8 with a remainder of 16.
Put 8 as the next digit of the answer. 
Result so far: 409.24528
Deduct 424 from 440 and we're left with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Moving on to step 11:
If we divide 160 by 53, we get 3 and a remainder of 1.
Record the quotient 3 as the next digit in the result. 
Result so far: 409.245283
If we subtract 159 from 160, we get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Let's proceed to step 12:
53 can be fit into 10 0 times, resulting in a remainder of 10.
Write down 0 as next digit of the result. 
Result so far: 409.245283
Deduct 0 from 10 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Going ahead to step 13:
If we divide 100 by 53, we get 1 and a remainder of 47.
Put 1 as the next digit of the answer. 
Result so far: 409.24528301
Deduct 53 from 100 and we're left with 47.
Since there are no more digits in the dividend, we add a zero to the remainder making it 470, and continue the process.

Our division results in 409.24528301 with a remaining 4.7e-08.