We're dividing 15250096 by 21 
We want to figure out the number of times 15250096 can be divided by 21.

Let's proceed to step 1:
When dividing 1 by 21, we get 0 with a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 1 after subtracting 0 from 1.
Grab the next digit (5) from the dividend, add it to 1, then carry on: 15 / 21

Moving on to step 2:
The number 21 fits into 15 0 times, leaving a remainder of 15.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 15, we end up with 15.
Take the next digit (2) from the dividend and append it to 15, then repeat: 152 / 21

Advancing to step 3:
21 goes into 152 7 times with a remainder of 5.
Record the quotient 7 as the next digit in the result. 
Result so far: 7.0
Subtracting 147 from 152 leaves us with 5.
Take the next digit (5) from the dividend and append it to 5, then repeat: 55 / 21

On to step 4:
If we divide 55 by 21, we get 2 and a remainder of 13.
The number 2 becomes the next digit in our result. 
Result so far: 72.0
Subtract 42 from 55 to get 13.
Include the next digit (0) from the dividend after 13, then repeat: 130 / 21

Moving on to step 5:
If we divide 130 by 21, we get 6 and a remainder of 4.
Use 6 as the next digit of our solution. 
Result so far: 726.0
Subtract 126 from 130 to get 4.
Fetch the next digit (0) from the dividend, attach it to 4 and continue: 40 / 21

Advancing to step 6:
21 can be fit into 40 1 times, resulting in a remainder of 19.
Use 1 as the next digit of our solution. 
Result so far: 7261.0
Deduct 21 from 40 and we're left with 19.
Include the next digit (9) from the dividend after 19, then repeat: 199 / 21

On to step 7:
The number 21 fits into 199 9 times, leaving a remainder of 10.
The number 9 becomes the next digit in our result. 
Result so far: 72619.0
If we take 189 away from 199, we end up with 10.
Include the next digit (6) from the dividend after 10, then repeat: 106 / 21

Moving on to step 8:
21 goes into 106 5 times with a remainder of 1.
The next digit of our result is 5. 
Result so far: 726195.0
Subtract 105 from 106 to 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.

On to step 9:
The number 21 fits into 10 0 times, leaving a remainder of 10.
Write down 0 as next digit of the result. 
Result so far: 726195.0
Subtract 0 from 10 to get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Let's proceed to step 10:
When dividing 100 by 21, we get 4 with a remainder of 16.
The number 4 becomes the next digit in our result. 
Result so far: 726195.04
If we subtract 84 from 100, we get 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Step 11:
21 can be fit into 160 7 times, resulting in a remainder of 13.
The number 7 becomes the next digit in our result. 
Result so far: 726195.047
The remainder is 13 after subtracting 147 from 160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Advancing to step 12:
When dividing 130 by 21, we get 6 with a remainder of 4.
The next digit of our result is 6. 
Result so far: 726195.0476
If we subtract 126 from 130, we get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Let's proceed to step 13:
The number 21 fits into 40 1 times, leaving a remainder of 19.
The number 1 becomes the next digit in our result. 
Result so far: 726195.04761
If we subtract 21 from 40, we get 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Moving on to step 14:
The number 21 fits into 190 9 times, leaving a remainder of 1.
Write down 9 as next digit of the result. 
Result so far: 726195.047619
Deduct 189 from 190 and we're left with 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

Going ahead to step 15:
When dividing 10 by 21, we get 0 with a remainder of 10.
Put 0 as the next digit of the answer. 
Result so far: 726195.047619
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.

Advancing to step 16:
21 goes into 100 4 times with a remainder of 16.
Write down 4 as next digit of the result. 
Result so far: 726195.04761904
If we subtract 84 from 100, we get 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

In conclusion, the division gives 726195.04761904 with a balance of 1.6e-08.