Numbers There are different types of numbers in the world. Each number is different from another, yet they may share some common characteristics. To help themselves keep track of and understand the similarities and differences between numbers, mathematicians have developed a grouping system that categorizes and describes numbers based on their characteristics. Some of the most common groups in the system are: Natural numbers Whole numbers Integers Rationals Real numbers Prime numbers Natural numbers The natural numbers are all the numbers that you learn when you're a baby, like 1, 2, 3, 4, 5, 6 and on and on. The natural numbers are also sometimes called the counting numbers because they're the first numbers you learn how to count. Zero is not a natural number. Whole Numbers The whole numbers are the natural numbers and zero. i.e 0, 1,2,3,4,5..... Integers Integers are a special group or category of numbers that: Consist of the set of numbers: {. . .-4, -3, -2, -1, 0, 1, 2, 3...
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