In this investigation, we work with pentominoes, five squares, and triominoes, 3 squares, where we study the unique shapes from constructing them in all different…
In 1979 death struck the city of Ekaterinburg. Without warning, people suddenly started to get sick. At least 94 people were stricken and at least…
When in grade 1, locomotives learn by going round and round in circles on specially created tracks like the one on the right. The circular…
When, Polyo, wants to rebel from her claustrophobic family, she seeks out solitude to work on very Un-Babushka-like puzzles. That means she wants puzzles where…
Yasmin, a baby Yeti living with her family in the Himalayas, decided that she was going to make trees out of paper. She folded a…
Find 3 positive integers x, y and z which satisfy this equation: Using this solution, find a different solution by changing one and only one…
This is a game for two wolves. Wolves take turns eating any number of pigs in the same row. The wolf that eats the last…
This game is the same as ordinary tic-tac-toe, except that on each turn a player can choose to play an X or an O. You…
Beaumaris castle in Wales was the largest of the Welsh castles built by King Edward I (r. 1272-1307) Construction began in 1295, but was never…
When painting this painting of a music lesson, Vermeer, the great Dutch artist, dropped his paintbrush on the tiled floor. He noticed that two ends…