For the walls of the house John would use large planks of wood. Each plank needs 5 pieces of nails to be secured and he would use 41 planks. How many nails does John need for the house wall?
1. How many nails does one plank need? 
5 nails

2. How many nails does 41 planks need? 
41 * 5 nails = 205 nails