A little rabbit wants to cross the river. He needs to lay ten stones on the river. At this time, there are five stones on the river. The rabbit moves three stones back for the first time and two stones back for the second time. But the river washes away one stone. How many stones the rabbit still need to move?~(adapted from $$2005$$ Math kangaroo Problems, Level $$1-2$$, Question \#$$6$$) 
Overseas Competition->Knowledge Point->Calculation Modules->Whole Numbers->Whole Numbers Addition and Subtraction ->Addition and Subtraction of Whole Numbers->Questions Involving Addition and Subtraction
$5+3+2-1=9$，$10-9=1$ 