2 + 3 // expression that evaluates to number 5.

1 + 2 + 3 // another longer expression evaluating to number 6

5 - 6.5 // this expression evaluates to number -1.5 (minus one point five)

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2 * 3 // using the multiplication operator, this expression evaluates to number 6

10 / 2 // evaluates to number 5

10 / 3 // evaluates to number 3.3333333333333335

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3**3 // evaluates to 27.  The double asterisk, “**”, is the exponential operator.  3 * 3 * 3 = 27 

16 % 5 // evaluates to 1.  The ‘%’ symbol returns the remainder of the two numbers divided. 16/5 = 3, with a remainder of 1.