For the walls of the house John would use large planks of wood. Each plank needs 1 pieces of nails to be secured and he would use 50 planks. How many nails does John need for the house wall?
1. How many nails does ONE plank need? ONE plank needs ONE nail. 
2. How many nails does 50 planks need? 50 planks need 50 nails.