HOW TO HANDLE + OR - BEFORE A PARENTHESIS (4th & 3rd grade)
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We learn how to handle the + and - signs before parentheses. Algebraic calculation is introduced in 8th grade (4ème in the French system) but needs to be mastered by 9th grade (3ème in the French system).
Video Outline
00:00 Introduction and key issues
00:27 Learning the rule with examples
02:45 Presentation of the 2 challenging calculations
03:03 1st challenging calculation
04:32 2nd challenging calculation
06:51 Video summary