We look at the division of 51990213 by 258 
Let's see how many times 258 fits into 51990213.

Advancing to step 1:
5 divided by 258 is 0 with a remainder of 5.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 5 and we're left with 5.
Take the next digit (1) from the dividend and append it to 5, then repeat: 51 / 258

Step 2:
The number 258 fits into 51 0 times, leaving a remainder of 51.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 51 after subtracting 0 from 51.
Take the next digit (9) from the dividend and append it to 51, then repeat: 519 / 258

Let's proceed to step 3:
If we divide 519 by 258, we get 2 and a remainder of 3.
The next digit of our result is 2. 
Result so far: 2.0
Deduct 516 from 519 and we're left with 3.
Include the next digit (9) from the dividend after 3, then repeat: 39 / 258

Going ahead to step 4:
When dividing 39 by 258, we get 0 with a remainder of 39.
Use 0 as the next digit of our solution. 
Result so far: 20.0
The remainder is 39 after subtracting 0 from 39.
Append the next digit (0) from the dividend to 39 and continue with: 390 / 258

Step 5:
The number 258 fits into 390 1 times, leaving a remainder of 132.
The number 1 becomes the next digit in our result. 
Result so far: 201.0
Subtracting 258 from 390 leaves us with 132.
Take the next digit (2) from the dividend and append it to 132, then repeat: 1322 / 258

Advancing to step 6:
1322 divided by 258 is 5 with a remainder of 32.
The number 5 becomes the next digit in our result. 
Result so far: 2015.0
Deduct 1290 from 1322 and we're left with 32.
Include the next digit (1) from the dividend after 32, then repeat: 321 / 258

Going ahead to step 7:
258 goes into 321 1 times with a remainder of 63.
Record the quotient 1 as the next digit in the result. 
Result so far: 20151.0
The remainder is 63 after subtracting 258 from 321.
Fetch the next digit (3) from the dividend, attach it to 63 and continue: 633 / 258

Step 8:
258 goes into 633 2 times with a remainder of 117.
Record the quotient 2 as the next digit in the result. 
Result so far: 201512.0
If we subtract 516 from 633, we get 117.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1170, and continue the process.

Going ahead to step 9:
When dividing 1170 by 258, we get 4 with a remainder of 138.
Use 4 as the next digit of our solution. 
Result so far: 201512.4
If we take 1032 away from 1170, we end up with 138.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1380, and continue the process.

Step 10:
1380 divided by 258 is 5 with a remainder of 90.
Put 5 as the next digit of the answer. 
Result so far: 201512.45
Deduct 1290 from 1380 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 11:
The number 258 fits into 900 3 times, leaving a remainder of 126.
Record the quotient 3 as the next digit in the result. 
Result so far: 201512.453
Subtract 774 from 900 to get 126.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1260, and continue the process.

Step 12:
When dividing 1260 by 258, we get 4 with a remainder of 228.
Record the quotient 4 as the next digit in the result. 
Result so far: 201512.4534
Subtract 1032 from 1260 to get 228.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2280, and continue the process.

Let's proceed to step 13:
258 goes into 2280 8 times with a remainder of 216.
Record the quotient 8 as the next digit in the result. 
Result so far: 201512.45348
The remainder is 216 after subtracting 2064 from 2280.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2160, and continue the process.

Moving on to step 14:
The number 258 fits into 2160 8 times, leaving a remainder of 96.
Write down 8 as next digit of the result. 
Result so far: 201512.453488
If we take 2064 away from 2160, we end up with 96.
Since there are no more digits in the dividend, we add a zero to the remainder making it 960, and continue the process.

After the division, we end up with 201512.453488 and a remainder of 9.6e-06.