# Mathematical Terms

 Set A group or collection of objects Empty Set/Null Set A set with no members Finite Set A set in which all members can be listed Infinite Set A set in which it is not possible to name all members Subset A set contained in another set Natural Numbers or Counting Numbers The set of numbers beginning with one {1, 2, 3, ...} used for most counting Whole Numbers The set of natural numbers that includes zero as an element {0, 1, 2, ...} Integers The set of whole numbers and their opposites Rational Numbers The set of integers and all fractions and their decimal equivalents Expression A combination of numbers and mathematical operations Evaluate Find the numerical value of an expression Absolute Value The distance a number is from zero on the number line Sum Obtained when you add 2 rational numbers Difference Obtained when you subtract 2 rational numbers Product Obtained when you multiply 2 rational numbers Quotient Obtained when you divide 2 rational numbers Undefined Obtained when you try to divide a rational number by zero Reciprocals Two numbers whose product is one