Square Dance (patterns)

Square Dance (patterns)

There are only a few slides in this puzzle so before heading on to the next one, your students and you should study the image and come up with conjectures about how the images are created and what to expect on the next slide. This first slide has too little...
Uncracked 33 (negative integers, exponents)

Uncracked 33 (negative integers, exponents)

Uncracked 114 (Diophantus of Alexandria, c. 215-290) Students working with exponents should be asked to find which values of n from 0-100 are possible by summing the cubes of three positive integers: a^3 + b^3 + c^3 = n. Next, ask if the cubes can be negative. This is...
Hex (strategy game)

Hex (strategy game)

Hex (Piet Hein, 1942) I’ve been using a small variant of hex in the age 5 to 7 classroom for several years. Apart from the smaller size, the only other innovation is to insist that the first player plays on the perimeter on their first move. Without a rule like...