We're dividing 54590251 by 450 
We want to figure out the number of times 54590251 can be divided by 450.

Let's proceed to step 1:
The number 450 fits into 5 0 times, leaving a remainder of 5.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 5 and we're left with 5.
Fetch the next digit (4) from the dividend, attach it to 5 and continue: 54 / 450

Step 2:
The number 450 fits into 54 0 times, leaving a remainder of 54.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtracting 0 from 54 leaves us with 54.
Grab the next digit (5) from the dividend, add it to 54, then carry on: 545 / 450

Let's proceed to step 3:
450 goes into 545 1 times with a remainder of 95.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Subtract 450 from 545 to get 95.
Bring next digit (9) of the dividend behind the 95 and repeat the process: 959 / 450

Moving on to step 4:
450 can be fit into 959 2 times, resulting in a remainder of 59.
The number 2 becomes the next digit in our result. 
Result so far: 12.0
Subtracting 900 from 959 leaves us with 59.
Include the next digit (0) from the dividend after 59, then repeat: 590 / 450

Step 5:
The number 450 fits into 590 1 times, leaving a remainder of 140.
Write down 1 as next digit of the result. 
Result so far: 121.0
If we take 450 away from 590, we end up with 140.
Grab the next digit (2) from the dividend, add it to 140, then carry on: 1402 / 450

On to step 6:
When dividing 1402 by 450, we get 3 with a remainder of 52.
Use 3 as the next digit of our solution. 
Result so far: 1213.0
Deduct 1350 from 1402 and we're left with 52.
Bring next digit (5) of the dividend behind the 52 and repeat the process: 525 / 450

Moving on to step 7:
450 goes into 525 1 times with a remainder of 75.
Use 1 as the next digit of our solution. 
Result so far: 12131.0
If we take 450 away from 525, we end up with 75.
Grab the next digit (1) from the dividend, add it to 75, then carry on: 751 / 450

Step 8:
When dividing 751 by 450, we get 1 with a remainder of 301.
Write down 1 as next digit of the result. 
Result so far: 121311.0
Subtract 450 from 751 to get 301.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3010, and continue the process.

Advancing to step 9:
450 goes into 3010 6 times with a remainder of 310.
Write down 6 as next digit of the result. 
Result so far: 121311.6
The remainder is 310 after subtracting 2700 from 3010.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3100, and continue the process.

Going ahead to step 10:
If we divide 3100 by 450, we get 6 and a remainder of 400.
The number 6 becomes the next digit in our result. 
Result so far: 121311.66
If we subtract 2700 from 3100, we get 400.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4000, and continue the process.

Our division results in 121311.66 with a remaining 0.4.