We look at the division of 51223954 by 257 
We're looking to find how many times 257 goes into 51223954.

Let's proceed to step 1:
The number 257 fits into 5 0 times, leaving a remainder of 5.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 5, we end up with 5.
Append the next digit (1) from the dividend to 5 and continue with: 51 / 257

Let's proceed to step 2:
The number 257 fits into 51 0 times, leaving a remainder of 51.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 51, we get 51.
Include the next digit (2) from the dividend after 51, then repeat: 512 / 257

Step 3:
257 goes into 512 1 times with a remainder of 255.
The next digit of our result is 1. 
Result so far: 1.0
Subtracting 257 from 512 leaves us with 255.
Include the next digit (2) from the dividend after 255, then repeat: 2552 / 257

On to step 4:
If we divide 2552 by 257, we get 9 and a remainder of 239.
Write down 9 as next digit of the result. 
Result so far: 19.0
If we subtract 2313 from 2552, we get 239.
Include the next digit (3) from the dividend after 239, then repeat: 2393 / 257

Step 5:
The number 257 fits into 2393 9 times, leaving a remainder of 80.
The number 9 becomes the next digit in our result. 
Result so far: 199.0
Deduct 2313 from 2393 and we're left with 80.
Include the next digit (9) from the dividend after 80, then repeat: 809 / 257

Moving on to step 6:
257 can be fit into 809 3 times, resulting in a remainder of 38.
The number 3 becomes the next digit in our result. 
Result so far: 1993.0
Subtract 771 from 809 to get 38.
Grab the next digit (5) from the dividend, add it to 38, then carry on: 385 / 257

Going ahead to step 7:
When dividing 385 by 257, we get 1 with a remainder of 128.
Put 1 as the next digit of the answer. 
Result so far: 19931.0
The remainder is 128 after subtracting 257 from 385.
Bring next digit (4) of the dividend behind the 128 and repeat the process: 1284 / 257

Step 8:
257 goes into 1284 4 times with a remainder of 256.
Record the quotient 4 as the next digit in the result. 
Result so far: 199314.0
If we subtract 1028 from 1284, 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.

Let's proceed to step 9:
When dividing 2560 by 257, we get 9 with a remainder of 247.
Write down 9 as next digit of the result. 
Result so far: 199314.9
Subtracting 2313 from 2560 leaves us with 247.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2470, and continue the process.

Advancing to step 10:
257 goes into 2470 9 times with a remainder of 157.
Write down 9 as next digit of the result. 
Result so far: 199314.99
The remainder is 157 after subtracting 2313 from 2470.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1570, and continue the process.

Our division results in 199314.99 with a remaining 0.157.