Many basic prerequisite college/school courses are entitiled "(course name) 101". Other courses that one would take at the same time may be titled "102", "103", etc. After taking "100" level courses, one progresses to "200" level courses. This numbering system allows for up to 99 courses in each diffculty level. When someone uses a phrase, i.e. "blogging 101", they are referring to basic principles for that subject that would be taught in a preliminary course.
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If you replace variables in an expression by numbers (in case there are any variables) and then do the indicated operations, you get a number. That final number is the "value" of the expression.
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The only numbers that divide evenly into 101 are 101 and 1. This means that 101 is a prime number.
It is an expression, not a property!It is an expression, not a property!It is an expression, not a property!It is an expression, not a property!