figure - an expression is made up of values and operators in the examplenotice that there can be any amount of spaces between the values and operators howeveralways start instructions at the beginning of the line when entering them into the interactive shell evaluating expressions when computer solves the expression and gets the value it has evaluated the expression evaluating an expression reduces the it to single valuejust like solving math problem reduces the problem to single numberthe answer the expressions and both evaluate to expressions can be of any sizebut they will always evaluate down to single value even single values are expressionsthe expression evaluates to the value for examplethe expression will evaluate down to the value through the following steps you don' see all of these steps in the interactive shell the interactive shell does them and just shows you the results post questions to