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2.2 - operations (meanings (divisibility tests (2 - ends 0, 2, 4, 6, 8, 3 …

- - - - 6 x is double 3 x
      - 4 x is double 2 x
    - - gives you 3 other facts
    - - 7 x 8 =
        
        7 x 7 + 7
        
        8 x 8 - 8
        
        7, 14, 21, 28, 35, 42, 49, 56
        
        7 x 2 x 2 x 2
        
        5 x 8 + (2 x 8)
- - - - meeting negative numbers and pretending you know all about them
        
        generally confusing the fuck out of everyone