It's a good idea to work out a simple rough estimate of the result of the division. This will help you to judge the more accurate result later. So in this case divide 600 by 50. 600/50 is the same as 60/5=12.
So you know now that the result is going to be about 12.
You can now do a long division:
52 ) 625
The first digit in the answer is likely to be 1 so multiply 52 by 1=52 and write it under 62 then subtract:
1
52 ) 625
-52
10
The quotient (result) now shows 1 above the 2 in the dividend. The remainder after subtraction is 10, so we "bring down" the remaining 5 in the dividend and attach it to the remainder:
1
52 ) 625
-52
105
Guided by the rough estimate the next digit is expected to be 2, so multiply 52 by 2=104, write this under 105 and subtract:
12
52 ) 625
-52
105
-104
1
In the quotient we write 2 next to the 1, giving us 12 as the quotient (as expected). We also have the remainder (result of the subtraction)=1. And that's it! 625 divided by 52 is 12 remainder 1.