We divide 21255390 by 843
We want to figure out the number of times 21255390 can be divided by 843.

Advancing to step 1:
843 goes into 2 0 times with a remainder of 2.
Write down 0 as next digit of the result. 
Result so far: 0.0
The remainder is 2 after subtracting 0 from 2.
Bring next digit (1) of the dividend behind the 2 and repeat the process: 21 / 843

On to step 2:
The number 843 fits into 21 0 times, leaving a remainder of 21.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 21 after subtracting 0 from 21.
Fetch the next digit (2) from the dividend, attach it to 21 and continue: 212 / 843

Moving on to step 3:
212 divided by 843 is 0 with a remainder of 212.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtract 0 from 212 to get 212.
Include the next digit (5) from the dividend after 212, then repeat: 2125 / 843

Going ahead to step 4:
When dividing 2125 by 843, we get 2 with a remainder of 439.
Put 2 as the next digit of the answer. 
Result so far: 2.0
Deduct 1686 from 2125 and we're left with 439.
Fetch the next digit (5) from the dividend, attach it to 439 and continue: 4395 / 843

Going ahead to step 5:
843 goes into 4395 5 times with a remainder of 180.
Write down 5 as next digit of the result. 
Result so far: 25.0
The remainder is 180 after subtracting 4215 from 4395.
Take the next digit (3) from the dividend and append it to 180, then repeat: 1803 / 843

Step 6:
The number 843 fits into 1803 2 times, leaving a remainder of 117.
Put 2 as the next digit of the answer. 
Result so far: 252.0
Subtracting 1686 from 1803 leaves us with 117.
Grab the next digit (9) from the dividend, add it to 117, then carry on: 1179 / 843

Step 7:
843 goes into 1179 1 times with a remainder of 336.
Record the quotient 1 as the next digit in the result. 
Result so far: 2521.0
Subtracting 843 from 1179 leaves us with 336.
Bring next digit (0) of the dividend behind the 336 and repeat the process: 3360 / 843

Step 8:
The number 843 fits into 3360 3 times, leaving a remainder of 831.
Use 3 as the next digit of our solution. 
Result so far: 25213.0
If we take 2529 away from 3360, we end up with 831.
Since there are no more digits in the dividend, we add a zero to the remainder making it 8310, and continue the process.

Advancing to step 9:
The number 843 fits into 8310 9 times, leaving a remainder of 723.
Record the quotient 9 as the next digit in the result. 
Result so far: 25213.9
Subtracting 7587 from 8310 leaves us with 723.
Since there are no more digits in the dividend, we add a zero to the remainder making it 7230, and continue the process.

Moving on to step 10:
843 goes into 7230 8 times with a remainder of 486.
Record the quotient 8 as the next digit in the result. 
Result so far: 25213.98
Subtract 6744 from 7230 to get 486.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4860, and continue the process.

Let's proceed to step 11:
The number 843 fits into 4860 5 times, leaving a remainder of 645.
Record the quotient 5 as the next digit in the result. 
Result so far: 25213.985
If we take 4215 away from 4860, we end up with 645.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6450, and continue the process.

On to step 12:
The number 843 fits into 6450 7 times, leaving a remainder of 549.
The next digit of our result is 7. 
Result so far: 25213.9857
Subtract 5901 from 6450 to get 549.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5490, and continue the process.

On to step 13:
If we divide 5490 by 843, we get 6 and a remainder of 432.
Record the quotient 6 as the next digit in the result. 
Result so far: 25213.98576
If we subtract 5058 from 5490, we get 432.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4320, and continue the process.

Step 14:
When dividing 4320 by 843, we get 5 with a remainder of 105.
The next digit of our result is 5. 
Result so far: 25213.985765
The remainder is 105 after subtracting 4215 from 4320.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1050, and continue the process.

Step 15:
The number 843 fits into 1050 1 times, leaving a remainder of 207.
The next digit of our result is 1. 
Result so far: 25213.9857651
The remainder is 207 after subtracting 843 from 1050.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2070, and continue the process.

On to step 16:
The number 843 fits into 2070 2 times, leaving a remainder of 384.
Put 2 as the next digit of the answer. 
Result so far: 25213.98576512
If we subtract 1686 from 2070, we get 384.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3840, and continue the process.

The final outcome is 25213.98576512, with a leftover of 3.84e-07.