1. Anno’s Mysterious Multiplying Jar
Concept: Multiplication
Main Idea: The mathematical pattern of multiplying a number by the next smaller number down to one is called factorial.

2. Factorials
There are 3 baskets with 2 kittens in each basket, and each kitten is wearing one collar. How many collars are there?
How could you pictorially represent this?
How could you write this as a multiplication problem?
The simplified way of writing this is 3! which means:
3! = 3 x 2 x 1 = 6

3. Idea From:
Anno, M., & Anno M. (1983). Anno’s mysterious multiplying jar. New York: Philomel Books.