We look at the division of 21402840 by 752 
We want to figure out the number of times 21402840 can be divided by 752.

On to step 1:
If we divide 2 by 752, we get 0 and a remainder of 2.
Use 0 as the next digit of our solution. 
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 / 752

Let's proceed to step 2:
21 divided by 752 is 0 with 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.
Include the next digit (4) from the dividend after 21, then repeat: 214 / 752

Moving on to step 3:
If we divide 214 by 752, we get 0 and a remainder of 214.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 214 after subtracting 0 from 214.
Bring next digit (0) of the dividend behind the 214 and repeat the process: 2140 / 752

On to step 4:
The number 752 fits into 2140 2 times, leaving a remainder of 636.
The next digit of our result is 2. 
Result so far: 2.0
Subtract 1504 from 2140 to get 636.
Bring next digit (2) of the dividend behind the 636 and repeat the process: 6362 / 752

Let's proceed to step 5:
6362 divided by 752 is 8 with a remainder of 346.
The next digit of our result is 8. 
Result so far: 28.0
Deduct 6016 from 6362 and we're left with 346.
Bring next digit (8) of the dividend behind the 346 and repeat the process: 3468 / 752

Let's proceed to step 6:
752 can be fit into 3468 4 times, resulting in a remainder of 460.
Put 4 as the next digit of the answer. 
Result so far: 284.0
If we subtract 3008 from 3468, we get 460.
Append the next digit (4) from the dividend to 460 and continue with: 4604 / 752

Let's proceed to step 7:
When dividing 4604 by 752, we get 6 with a remainder of 92.
The number 6 becomes the next digit in our result. 
Result so far: 2846.0
Deduct 4512 from 4604 and we're left with 92.
Grab the next digit (0) from the dividend, add it to 92, then carry on: 920 / 752

Going ahead to step 8:
920 divided by 752 is 1 with a remainder of 168.
Write down 1 as next digit of the result. 
Result so far: 28461.0
If we take 752 away from 920, we end up with 168.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1680, and continue the process.

Going ahead to step 9:
752 can be fit into 1680 2 times, resulting in a remainder of 176.
Use 2 as the next digit of our solution. 
Result so far: 28461.2
The remainder is 176 after subtracting 1504 from 1680.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1760, and continue the process.

On to step 10:
752 goes into 1760 2 times with a remainder of 256.
Write down 2 as next digit of the result. 
Result so far: 28461.22
If we subtract 1504 from 1760, we get 256.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2560, and continue the process.

The quotient of the division is 28461.22, and the remainder is 0.256.