We look at the division of 45451821 by 408 
Our goal is to divide 45451821 by 408.

Let's proceed to step 1:
408 goes into 4 0 times with a remainder of 4.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 4 and we're left with 4.
Grab the next digit (5) from the dividend, add it to 4, then carry on: 45 / 408

Going ahead to step 2:
408 can be fit into 45 0 times, resulting in a remainder of 45.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 45 and we're left with 45.
Include the next digit (4) from the dividend after 45, then repeat: 454 / 408

Advancing to step 3:
The number 408 fits into 454 1 times, leaving a remainder of 46.
Write down 1 as next digit of the result. 
Result so far: 1.0
Deduct 408 from 454 and we're left with 46.
Fetch the next digit (5) from the dividend, attach it to 46 and continue: 465 / 408

On to step 4:
408 goes into 465 1 times with a remainder of 57.
Put 1 as the next digit of the answer. 
Result so far: 11.0
Deduct 408 from 465 and we're left with 57.
Fetch the next digit (1) from the dividend, attach it to 57 and continue: 571 / 408

Advancing to step 5:
If we divide 571 by 408, we get 1 and a remainder of 163.
Write down 1 as next digit of the result. 
Result so far: 111.0
Subtracting 408 from 571 leaves us with 163.
Take the next digit (8) from the dividend and append it to 163, then repeat: 1638 / 408

Going ahead to step 6:
The number 408 fits into 1638 4 times, leaving a remainder of 6.
Write down 4 as next digit of the result. 
Result so far: 1114.0
If we subtract 1632 from 1638, we get 6.
Fetch the next digit (2) from the dividend, attach it to 6 and continue: 62 / 408

On to step 7:
408 goes into 62 0 times with a remainder of 62.
Put 0 as the next digit of the answer. 
Result so far: 11140.0
Deduct 0 from 62 and we're left with 62.
Grab the next digit (1) from the dividend, add it to 62, then carry on: 621 / 408

Step 8:
621 divided by 408 is 1 with a remainder of 213.
Put 1 as the next digit of the answer. 
Result so far: 111401.0
The remainder is 213 after subtracting 408 from 621.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2130, and continue the process.

Going ahead to step 9:
2130 divided by 408 is 5 with a remainder of 90.
Record the quotient 5 as the next digit in the result. 
Result so far: 111401.5
Deduct 2040 from 2130 and we're left with 90.
Since there are no more digits in the dividend, we add a zero to the remainder making it 900, and continue the process.

On to step 10:
If we divide 900 by 408, we get 2 and a remainder of 84.
The next digit of our result is 2. 
Result so far: 111401.52
Subtract 816 from 900 to get 84.
Since there are no more digits in the dividend, we add a zero to the remainder making it 840, and continue the process.

Advancing to step 11:
If we divide 840 by 408, we get 2 and a remainder of 24.
Record the quotient 2 as the next digit in the result. 
Result so far: 111401.522
Deduct 816 from 840 and we're left with 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

After the division, we end up with 111401.522 and a remainder of 0.0024.