Let's divide 253175 by 21
We want to figure out the number of times 253175 can be divided by 21.

Let's proceed to step 1:
2 divided by 21 is 0 with a remainder of 2.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 2 leaves us with 2.
Include the next digit (5) from the dividend after 2, then repeat: 25 / 21

Let's proceed to step 2:
21 goes into 25 1 times with a remainder of 4.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Subtract 21 from 25 to get 4.
Fetch the next digit (3) from the dividend, attach it to 4 and continue: 43 / 21

Step 3:
21 can be fit into 43 2 times, resulting in a remainder of 1.
Put 2 as the next digit of the answer. 
Result so far: 12.0
Deduct 42 from 43 and we're left with 1.
Append the next digit (1) from the dividend to 1 and continue with: 11 / 21

On to step 4:
When dividing 11 by 21, we get 0 with a remainder of 11.
Put 0 as the next digit of the answer. 
Result so far: 120.0
Deduct 0 from 11 and we're left with 11.
Bring next digit (7) of the dividend behind the 11 and repeat the process: 117 / 21

Step 5:
117 divided by 21 is 5 with a remainder of 12.
Record the quotient 5 as the next digit in the result. 
Result so far: 1205.0
If we take 105 away from 117, we end up with 12.
Append the next digit (5) from the dividend to 12 and continue with: 125 / 21

Moving on to step 6:
125 divided by 21 is 5 with a remainder of 20.
Write down 5 as next digit of the result. 
Result so far: 12055.0
If we subtract 105 from 125, we get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Advancing to step 7:
200 divided by 21 is 9 with a remainder of 11.
Use 9 as the next digit of our solution. 
Result so far: 12055.9
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.

Step 8:
When dividing 110 by 21, we get 5 with a remainder of 5.
The next digit of our result is 5. 
Result so far: 12055.95
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.

On to step 9:
50 divided by 21 is 2 with a remainder of 8.
The number 2 becomes the next digit in our result. 
Result so far: 12055.952
Deduct 42 from 50 and we're left with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Going ahead to step 10:
80 divided by 21 is 3 with a remainder of 17.
The next digit of our result is 3. 
Result so far: 12055.9523
Subtract 63 from 80 to get 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Going ahead to step 11:
21 can be fit into 170 8 times, resulting in a remainder of 2.
Put 8 as the next digit of the answer. 
Result so far: 12055.95238
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.

Moving on to step 12:
21 goes into 20 0 times with a remainder of 20.
Record the quotient 0 as the next digit in the result. 
Result so far: 12055.95238
If we take 0 away from 20, we end up 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.

Going ahead to step 13:
If we divide 200 by 21, we get 9 and a remainder of 11.
The number 9 becomes the next digit in our result. 
Result so far: 12055.9523809
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.

Advancing to step 14:
110 divided by 21 is 5 with a remainder of 5.
The number 5 becomes the next digit in our result. 
Result so far: 12055.95238095
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.

After the division, we end up with 12055.95238095 and a remainder of 5e-09.