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Five strands of mathematical proficiency 
Workshop 1: Inspiring reasoning through rich tasks
Unequal Averages 
Summing Consecutive Numbers 
Seven Squares 
Steel Cables
Suggested follow-up reading: Train Spotters' Paradise
Workshop 2: Engaging all learners through problem solving
Cyclic Quadrilaterals 
CMEP Resources:
Irrational Constructions
Quadrature of the lunes
Factors and Multiples Game or Got It! 
Cryptarithms to take away
Suggested follow-up reading: Enriching the Secondary Curriculum