Celtic Counting (counting, proof)

Celtic Counting (counting, proof)

Celtic Counting requires students to trace an under and over pattern – counting the Celtic loops. How many loops exist in this knot? There are two. How many loops does this knot have? There are three. The following slides have larger knots, but students age 6+...
Integral Centrifuge (multiplication of +/-1)

Integral Centrifuge (multiplication of +/-1)

This spinning centrifuge has a matching set of -1 (South) and +1 (North) magnets on the inner and outer ring. The inner ring is the one that spins. You must try to find a combination of +1s and -1s so that when it is rotated away from this all-repulsive position there...
Ninja Bed Bugs (multiplication)

Ninja Bed Bugs (multiplication)

Smothering Ninja Bed Bugs is important to stop itchy nocturnal sleeps on you King Size bed.   Here is an infestation of your king size bed. It looks nasty. Your job is to smother all those Ninja Bed Bugs by covering them with rectangles. The Ninja Bed Bug Score...
Graphene Trampoline (logic & probability)

Graphene Trampoline (logic & probability)

  Richard Smalley was awarded the Nobel prize in Chemistry for the discovery that he could make a very very small soccer ball out of Carbon atoms. In 2005 he suddenly began to shrink. He ended up so small that he could bounce on the little trampolines that make...