Automate Math worksheet in LibreOffice Calc

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http://ubuntuforums.org – Does anyone know how I could do the following in LibreOffice Calc: Cell A2 contains the value: 2+3 Cell A3 should contain the student/users answer, in this case: 5 Cell A4 gives a red X for wrong or a green check for correct Without having it process =2+3 how can I have LibreOffice Calc convert a string 2+3 to process it like =2+3 ? If I have to do it manually that's ok, I thought I could automate it. (Hardware)