12 Days (addition, logic, factoring)

12 Days (addition, logic, factoring)

The brilliant artwork in this puzzle was done for me by Mr. Cuddington. Here is the challenge. You want to print up a card game with one card of value 1, two cards of value 2, three cards of value 3… twelve cards of value 12… Here is a page with 8 cards....
Primitive Lightning (composite divisors)

Primitive Lightning (composite divisors)

Show your class a lightning strike with the number 88. This is how it looks. Pause for two minutes. Let them try to figure out some of the rules governing its construction. You can think too. What observations do you make? Here is a possible list: When a split occurs...