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  • 14 votes cast
Feb
21
awarded  Nice Question
Oct
16
awarded  Notable Question
Dec
10
awarded  Popular Question
Jul
30
awarded  Supporter
Jul
30
revised What calculation shortcuts exist to help or speed-up mental (or paper) calculations?
made community wiki - sorry, didn't think!
Jul
29
awarded  Student
Jul
29
asked What's the most effective ways of teaching kids - times tables?
Jul
29
asked What calculation shortcuts exist to help or speed-up mental (or paper) calculations?
Jul
29
awarded  Autobiographer