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1- Declaring, instantiating, and using local variables In Java, to declare a local variable (what is a local variable?), you write the data type and then the name of the variable and then you type a semicolon to finish the statement like this: int number; Here you declared a variable of type integer and named it number" ---But wait! Where do I write this?! Put your declaration line int number;" inside your main method "public static void main(String[] args)" instantiating your variables would follow the syntax in the following example: int number=5; Declare a double variable, call it mydouble and give it the value 2.5 and then print it. Remember: You can always apply mathematical operations in java (addition, subtraction multiplication and division, mod, ++,-, etc)