We divide 21851450 by 510
We want to figure out the number of times 21851450 can be divided by 510.

Step 1:
If we divide 2 by 510, we get 0 and a remainder of 2.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 2 to get 2.
Append the next digit (1) from the dividend to 2 and continue with: 21 / 510

On to step 2:
The number 510 fits into 21 0 times, leaving a remainder of 21.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 21, we end up with 21.
Include the next digit (8) from the dividend after 21, then repeat: 218 / 510

Step 3:
The number 510 fits into 218 0 times, leaving a remainder of 218.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 218 and we're left with 218.
Fetch the next digit (5) from the dividend, attach it to 218 and continue: 2185 / 510

Step 4:
The number 510 fits into 2185 4 times, leaving a remainder of 145.
Use 4 as the next digit of our solution. 
Result so far: 4.0
The remainder is 145 after subtracting 2040 from 2185.
Take the next digit (1) from the dividend and append it to 145, then repeat: 1451 / 510

On to step 5:
The number 510 fits into 1451 2 times, leaving a remainder of 431.
Write down 2 as next digit of the result. 
Result so far: 42.0
Subtracting 1020 from 1451 leaves us with 431.
Fetch the next digit (4) from the dividend, attach it to 431 and continue: 4314 / 510

On to step 6:
4314 divided by 510 is 8 with a remainder of 234.
Put 8 as the next digit of the answer. 
Result so far: 428.0
Deduct 4080 from 4314 and we're left with 234.
Take the next digit (5) from the dividend and append it to 234, then repeat: 2345 / 510

Advancing to step 7:
The number 510 fits into 2345 4 times, leaving a remainder of 305.
Use 4 as the next digit of our solution. 
Result so far: 4284.0
Subtract 2040 from 2345 to get 305.
Append the next digit (0) from the dividend to 305 and continue with: 3050 / 510

Let's proceed to step 8:
510 can be fit into 3050 5 times, resulting in a remainder of 500.
Put 5 as the next digit of the answer. 
Result so far: 42845.0
Subtracting 2550 from 3050 leaves us with 500.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5000, and continue the process.

On to step 9:
When dividing 5000 by 510, we get 9 with a remainder of 410.
The number 9 becomes the next digit in our result. 
Result so far: 42845.9
If we take 4590 away from 5000, we end up with 410.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4100, and continue the process.

On to step 10:
510 can be fit into 4100 8 times, resulting in a remainder of 20.
The number 8 becomes the next digit in our result. 
Result so far: 42845.98
If we take 4080 away from 4100, 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.

Moving on to step 11:
The number 510 fits into 200 0 times, leaving a remainder of 200.
Use 0 as the next digit of our solution. 
Result so far: 42845.98
If we subtract 0 from 200, we get 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2000, and continue the process.

Moving on to step 12:
The number 510 fits into 2000 3 times, leaving a remainder of 470.
Use 3 as the next digit of our solution. 
Result so far: 42845.9803
The remainder is 470 after subtracting 1530 from 2000.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4700, and continue the process.

Advancing to step 13:
When dividing 4700 by 510, we get 9 with a remainder of 110.
Write down 9 as next digit of the result. 
Result so far: 42845.98039
Subtract 4590 from 4700 to get 110.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1100, and continue the process.

Going ahead to step 14:
The number 510 fits into 1100 2 times, leaving a remainder of 80.
The next digit of our result is 2. 
Result so far: 42845.980392
If we subtract 1020 from 1100, we get 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 800, and continue the process.

On to step 15:
If we divide 800 by 510, we get 1 and a remainder of 290.
Write down 1 as next digit of the result. 
Result so far: 42845.9803921
The remainder is 290 after subtracting 510 from 800.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2900, and continue the process.

On to step 16:
510 can be fit into 2900 5 times, resulting in a remainder of 350.
The number 5 becomes the next digit in our result. 
Result so far: 42845.98039215
Deduct 2550 from 2900 and we're left with 350.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3500, and continue the process.

In conclusion, the division gives 42845.98039215 with a balance of 3.5e-07.