Difference: $17-9=8$  Move: Half of $8=4$ 
Marko has $$9$$ pieces of candy and Tomo has $$17$$ pieces of candy. How many pieces of candy does Tomo need to give to Marko so that each boy has the same number of pieces of candy? 

1) $$2$$ 
2) $$3$$ 
3) $$4$$ 
4) $$5$$ 
5) $$6$$ 