We're dividing 258490 by 57 
We're looking to find how many times 57 goes into 258490.

Moving on to step 1:
57 goes into 2 0 times with a remainder of 2.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 2, we get 2.
Append the next digit (5) from the dividend to 2 and continue with: 25 / 57

Moving on to step 2:
57 goes into 25 0 times with a remainder of 25.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 25 and we're left with 25.
Include the next digit (8) from the dividend after 25, then repeat: 258 / 57

On to step 3:
258 divided by 57 is 4 with a remainder of 30.
Put 4 as the next digit of the answer. 
Result so far: 4.0
Subtracting 228 from 258 leaves us with 30.
Bring next digit (4) of the dividend behind the 30 and repeat the process: 304 / 57

Step 4:
304 divided by 57 is 5 with a remainder of 19.
Write down 5 as next digit of the result. 
Result so far: 45.0
Subtract 285 from 304 to get 19.
Bring next digit (9) of the dividend behind the 19 and repeat the process: 199 / 57

Advancing to step 5:
The number 57 fits into 199 3 times, leaving a remainder of 28.
Put 3 as the next digit of the answer. 
Result so far: 453.0
Subtract 171 from 199 to get 28.
Take the next digit (0) from the dividend and append it to 28, then repeat: 280 / 57

Moving on to step 6:
57 can be fit into 280 4 times, resulting in a remainder of 52.
Record the quotient 4 as the next digit in the result. 
Result so far: 4534.0
Deduct 228 from 280 and we're left with 52.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

On to step 7:
If we divide 520 by 57, we get 9 and a remainder of 7.
Put 9 as the next digit of the answer. 
Result so far: 4534.9
Deduct 513 from 520 and we're left with 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Moving on to step 8:
57 can be fit into 70 1 times, resulting in a remainder of 13.
Record the quotient 1 as the next digit in the result. 
Result so far: 4534.91
Subtracting 57 from 70 leaves us with 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Advancing to step 9:
If we divide 130 by 57, we get 2 and a remainder of 16.
Use 2 as the next digit of our solution. 
Result so far: 4534.912
Subtracting 114 from 130 leaves us with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Step 10:
If we divide 160 by 57, we get 2 and a remainder of 46.
Use 2 as the next digit of our solution. 
Result so far: 4534.9122
Deduct 114 from 160 and we're left with 46.
Since there are no more digits in the dividend, we add a zero to the remainder making it 460, and continue the process.

The final result is 4534.9122 with a remainder of 0.00046.