Good and Pitiful marks

Aiyoh, although i did well in my maths, i could have gotten full marks. A zero cost me the only one mark which was lost. How sad. I actually put the right anwer but then i cancelled it and put the one without the zero. The answer was:750 hundreds) I put: 750 hundreds and then cancelled it and put 75 hundreds.) How careless of me. BUt whats done is done. I guess i can't really change it anyway.