Let's divide 365153 by 21
We want to figure out the number of times 365153 can be divided by 21.

Going ahead to step 1:
21 goes into 3 0 times with a remainder of 3.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 3 to get 3.
Grab the next digit (6) from the dividend, add it to 3, then carry on: 36 / 21

Let's proceed to step 2:
21 goes into 36 1 times with a remainder of 15.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
If we take 21 away from 36, we end up with 15.
Grab the next digit (5) from the dividend, add it to 15, then carry on: 155 / 21

Moving on to step 3:
The number 21 fits into 155 7 times, leaving a remainder of 8.
Write down 7 as next digit of the result. 
Result so far: 17.0
Subtracting 147 from 155 leaves us with 8.
Fetch the next digit (1) from the dividend, attach it to 8 and continue: 81 / 21

Let's proceed to step 4:
If we divide 81 by 21, we get 3 and a remainder of 18.
Put 3 as the next digit of the answer. 
Result so far: 173.0
If we take 63 away from 81, we end up with 18.
Append the next digit (5) from the dividend to 18 and continue with: 185 / 21

Step 5:
When dividing 185 by 21, we get 8 with a remainder of 17.
Put 8 as the next digit of the answer. 
Result so far: 1738.0
Subtracting 168 from 185 leaves us with 17.
Bring next digit (3) of the dividend behind the 17 and repeat the process: 173 / 21

Step 6:
21 goes into 173 8 times with a remainder of 5.
Put 8 as the next digit of the answer. 
Result so far: 17388.0
Subtract 168 from 173 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 7:
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: 17388.2
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.

Step 8:
21 goes into 80 3 times with a remainder of 17.
Put 3 as the next digit of the answer. 
Result so far: 17388.23
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.

On to step 9:
When dividing 170 by 21, we get 8 with a remainder of 2.
Use 8 as the next digit of our solution. 
Result so far: 17388.238
Deduct 168 from 170 and we're left 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.

Let's proceed to step 10:
The number 21 fits into 20 0 times, leaving a remainder of 20.
Record the quotient 0 as the next digit in the result. 
Result so far: 17388.238
The remainder is 20 after subtracting 0 from 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Going ahead to step 11:
When dividing 200 by 21, we get 9 with a remainder of 11.
Record the quotient 9 as the next digit in the result. 
Result so far: 17388.23809
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.

Step 12:
21 goes into 110 5 times with a remainder of 5.
The number 5 becomes the next digit in our result. 
Result so far: 17388.238095
Subtracting 105 from 110 leaves us 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.

Moving on to step 13:
21 can be fit into 50 2 times, resulting in a remainder of 8.
The number 2 becomes the next digit in our result. 
Result so far: 17388.2380952
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.

Step 14:
80 divided by 21 is 3 with a remainder of 17.
Use 3 as the next digit of our solution. 
Result so far: 17388.23809523
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.

The quotient of the division is 17388.23809523, and the remainder is 1.7e-08.