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JavaScript has only one type of numbers.

Numbers can be written with, or without decimals:

var x1 = 34.00; // Written with decimals var x2 = 34; // Written without decimals

Extra large or extra small numbers can be written with scientific (exponential) notation:

var y = 123e5; // 12300000 var z = 123e-5; // 0.00123

You will learn more about numbers later in this tutorial.