Anno

1
Annos 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). Annos mysterious
  multiplying jar. New York Philomel Books.