We're dividing 21510505 by 848 
We want to figure out the number of times 21510505 can be divided by 848.

On to step 1:
848 can be fit into 2 0 times, resulting in a remainder of 2.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 2 after subtracting 0 from 2.
Fetch the next digit (1) from the dividend, attach it to 2 and continue: 21 / 848

Moving on to step 2:
848 goes into 21 0 times with a remainder of 21.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 21 and we're left with 21.
Grab the next digit (5) from the dividend, add it to 21, then carry on: 215 / 848

Advancing to step 3:
If we divide 215 by 848, we get 0 and a remainder of 215.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 215 and we're left with 215.
Include the next digit (1) from the dividend after 215, then repeat: 2151 / 848

On to step 4:
When dividing 2151 by 848, we get 2 with a remainder of 455.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
If we take 1696 away from 2151, we end up with 455.
Take the next digit (0) from the dividend and append it to 455, then repeat: 4550 / 848

Let's proceed to step 5:
When dividing 4550 by 848, we get 5 with a remainder of 310.
The number 5 becomes the next digit in our result. 
Result so far: 25.0
Subtract 4240 from 4550 to get 310.
Include the next digit (5) from the dividend after 310, then repeat: 3105 / 848

Advancing to step 6:
When dividing 3105 by 848, we get 3 with a remainder of 561.
The next digit of our result is 3. 
Result so far: 253.0
Subtracting 2544 from 3105 leaves us with 561.
Fetch the next digit (0) from the dividend, attach it to 561 and continue: 5610 / 848

Moving on to step 7:
When dividing 5610 by 848, we get 6 with a remainder of 522.
The next digit of our result is 6. 
Result so far: 2536.0
Subtract 5088 from 5610 to get 522.
Include the next digit (5) from the dividend after 522, then repeat: 5225 / 848

Moving on to step 8:
848 can be fit into 5225 6 times, resulting in a remainder of 137.
The next digit of our result is 6. 
Result so far: 25366.0
Subtract 5088 from 5225 to get 137.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1370, and continue the process.

Advancing to step 9:
If we divide 1370 by 848, we get 1 and a remainder of 522.
Put 1 as the next digit of the answer. 
Result so far: 25366.1
Deduct 848 from 1370 and we're left with 522.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5220, and continue the process.

Advancing to step 10:
When dividing 5220 by 848, we get 6 with a remainder of 132.
The next digit of our result is 6. 
Result so far: 25366.16
If we take 5088 away from 5220, we end up with 132.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1320, and continue the process.

Advancing to step 11:
848 can be fit into 1320 1 times, resulting in a remainder of 472.
Use 1 as the next digit of our solution. 
Result so far: 25366.161
If we take 848 away from 1320, we end up with 472.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4720, and continue the process.

Advancing to step 12:
848 goes into 4720 5 times with a remainder of 480.
The number 5 becomes the next digit in our result. 
Result so far: 25366.1615
Subtracting 4240 from 4720 leaves us with 480.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4800, and continue the process.

Advancing to step 13:
If we divide 4800 by 848, we get 5 and a remainder of 560.
Write down 5 as next digit of the result. 
Result so far: 25366.16155
The remainder is 560 after subtracting 4240 from 4800.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5600, and continue the process.

The quotient of the division is 25366.16155, and the remainder is 0.00056.