We're dividing 915524 by 21 
We want to figure out the number of times 915524 can be divided by 21.

Advancing to step 1:
9 divided by 21 is 0 with a remainder of 9.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 9 to get 9.
Append the next digit (1) from the dividend to 9 and continue with: 91 / 21

Advancing to step 2:
The number 21 fits into 91 4 times, leaving a remainder of 7.
Use 4 as the next digit of our solution. 
Result so far: 4.0
Subtracting 84 from 91 leaves us with 7.
Take the next digit (5) from the dividend and append it to 7, then repeat: 75 / 21

Moving on to step 3:
21 can be fit into 75 3 times, resulting in a remainder of 12.
The next digit of our result is 3. 
Result so far: 43.0
Deduct 63 from 75 and we're left with 12.
Grab the next digit (5) from the dividend, add it to 12, then carry on: 125 / 21

Going ahead to step 4:
When dividing 125 by 21, we get 5 with a remainder of 20.
The number 5 becomes the next digit in our result. 
Result so far: 435.0
The remainder is 20 after subtracting 105 from 125.
Grab the next digit (2) from the dividend, add it to 20, then carry on: 202 / 21

Step 5:
When dividing 202 by 21, we get 9 with a remainder of 13.
Put 9 as the next digit of the answer. 
Result so far: 4359.0
If we take 189 away from 202, we end up with 13.
Take the next digit (4) from the dividend and append it to 13, then repeat: 134 / 21

Advancing to step 6:
If we divide 134 by 21, we get 6 and a remainder of 8.
Use 6 as the next digit of our solution. 
Result so far: 43596.0
Subtract 126 from 134 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.

On to step 7:
The number 21 fits into 80 3 times, leaving a remainder of 17.
Use 3 as the next digit of our solution. 
Result so far: 43596.3
The remainder is 17 after subtracting 63 from 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Advancing to step 8:
If we divide 170 by 21, we get 8 and a remainder of 2.
Put 8 as the next digit of the answer. 
Result so far: 43596.38
If we subtract 168 from 170, we get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Step 9:
21 can be fit into 20 0 times, resulting in a remainder of 20.
The next digit of our result is 0. 
Result so far: 43596.38
If we subtract 0 from 20, 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 10:
21 goes into 200 9 times with a remainder of 11.
The number 9 becomes the next digit in our result. 
Result so far: 43596.3809
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.

Moving on to step 11:
If we divide 110 by 21, we get 5 and a remainder of 5.
Write down 5 as next digit of the result. 
Result so far: 43596.38095
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.

Going ahead to step 12:
21 goes into 50 2 times with a remainder of 8.
The next digit of our result is 2. 
Result so far: 43596.380952
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 13:
The number 21 fits into 80 3 times, leaving a remainder of 17.
Use 3 as the next digit of our solution. 
Result so far: 43596.3809523
The remainder is 17 after subtracting 63 from 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Advancing to step 14:
When dividing 170 by 21, we get 8 with a remainder of 2.
Put 8 as the next digit of the answer. 
Result so far: 43596.38095238
If we subtract 168 from 170, we get 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

After the division, we end up with 43596.38095238 and a remainder of 2e-09.