We're dividing 21129412 by 325 
Our goal is to divide 21129412 by 325.

On to step 1:
325 can be fit into 2 0 times, resulting in a remainder of 2.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 2 leaves us with 2.
Take the next digit (1) from the dividend and append it to 2, then repeat: 21 / 325

Step 2:
21 divided by 325 is 0 with a remainder of 21.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 21 leaves us with 21.
Bring next digit (1) of the dividend behind the 21 and repeat the process: 211 / 325

Step 3:
If we divide 211 by 325, we get 0 and a remainder of 211.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 211, we get 211.
Fetch the next digit (2) from the dividend, attach it to 211 and continue: 2112 / 325

On to step 4:
2112 divided by 325 is 6 with a remainder of 162.
The number 6 becomes the next digit in our result. 
Result so far: 6.0
If we subtract 1950 from 2112, we get 162.
Bring next digit (9) of the dividend behind the 162 and repeat the process: 1629 / 325

Advancing to step 5:
325 can be fit into 1629 5 times, resulting in a remainder of 4.
Put 5 as the next digit of the answer. 
Result so far: 65.0
Deduct 1625 from 1629 and we're left with 4.
Grab the next digit (4) from the dividend, add it to 4, then carry on: 44 / 325

Let's proceed to step 6:
325 can be fit into 44 0 times, resulting in a remainder of 44.
Use 0 as the next digit of our solution. 
Result so far: 650.0
Subtracting 0 from 44 leaves us with 44.
Grab the next digit (1) from the dividend, add it to 44, then carry on: 441 / 325

Step 7:
441 divided by 325 is 1 with a remainder of 116.
The number 1 becomes the next digit in our result. 
Result so far: 6501.0
If we take 325 away from 441, we end up with 116.
Append the next digit (2) from the dividend to 116 and continue with: 1162 / 325

Moving on to step 8:
325 can be fit into 1162 3 times, resulting in a remainder of 187.
Use 3 as the next digit of our solution. 
Result so far: 65013.0
If we subtract 975 from 1162, we get 187.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1870, and continue the process.

Step 9:
325 goes into 1870 5 times with a remainder of 245.
The number 5 becomes the next digit in our result. 
Result so far: 65013.5
Deduct 1625 from 1870 and we're left with 245.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2450, and continue the process.

Step 10:
The number 325 fits into 2450 7 times, leaving a remainder of 175.
Write down 7 as next digit of the result. 
Result so far: 65013.57
Subtract 2275 from 2450 to get 175.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1750, and continue the process.

Going ahead to step 11:
325 can be fit into 1750 5 times, resulting in a remainder of 125.
The number 5 becomes the next digit in our result. 
Result so far: 65013.575
The remainder is 125 after subtracting 1625 from 1750.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1250, and continue the process.

Step 12:
If we divide 1250 by 325, we get 3 and a remainder of 275.
Use 3 as the next digit of our solution. 
Result so far: 65013.5753
The remainder is 275 after subtracting 975 from 1250.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2750, and continue the process.

Step 13:
325 goes into 2750 8 times with a remainder of 150.
The next digit of our result is 8. 
Result so far: 65013.57538
If we take 2600 away from 2750, we end up with 150.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1500, and continue the process.

Step 14:
325 goes into 1500 4 times with a remainder of 200.
The next digit of our result is 4. 
Result so far: 65013.575384
If we take 1300 away from 1500, we end up with 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2000, and continue the process.

Step 15:
If we divide 2000 by 325, we get 6 and a remainder of 50.
The number 6 becomes the next digit in our result. 
Result so far: 65013.5753846
Deduct 1950 from 2000 and we're left with 50.
Since there are no more digits in the dividend, we add a zero to the remainder making it 500, and continue the process.

Step 16:
The number 325 fits into 500 1 times, leaving a remainder of 175.
Record the quotient 1 as the next digit in the result. 
Result so far: 65013.57538461
The remainder is 175 after subtracting 325 from 500.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1750, and continue the process.

The final result is 65013.57538461 with a remainder of 1.75e-07.