## mark a section (Learn more)

class MyMath #when defining a class method start with self. def self.add(*numbers) numbers.inject(0) {|number, sum| sum += number} end def self.multiply(*numbers) numbers.inject(1) {|number, product| product *= number } end def self.difference(num1,num2) (num1-num2).abs end end #when calling a class method the syntax is ClassName.method_name puts MyMath.add(3,5,356,23,9) puts MyMath.add(84,2,42) puts MyMath.multiply(8,3,5) puts MyMath.difference(38,32) puts MyMath.difference(8,38)

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