list Visualising - advanced Age 16 to 18 Problems about visualising for use with Stage 5 students. list Representing - advanced Age 16 to 18 Problems about representing for use with Stage 5 students. list Complex numbers further Age 16 to 18 list The twizzle trail Age 14 to 16 Challenge level A geometrical arithmetic that can lead to complex numbers
list The twizzle trail Age 14 to 16 Challenge level A geometrical arithmetic that can lead to complex numbers