Day 10 in Mat115H

Today:

• Announcements
  • There is one more new assignment to hand in before your exam (which is on 10/8, two weeks from today).
  • Handout: "Crazy Clocks and Checking out Bars".
  • Your base problems are due next time (Tuesday).
  • Sorry: I don't have the Binary Card Trick pieces graded yet.

• The Mathematics of Fit the Third
  • Three tricks, p. 65
    • The addition sum
      • Who can play?
      • Can you do it more easily using smaller numbers?
      • How does it work?
      • Can you do it in binary?
    • Counting alternately up to 100
      • Who can play?
      • How does it work?
      • How could you beat Charles?
    • The '9' trick
      • Who can play?
      • Can you do it more easily using smaller numbers?
      • How does it work?

  • Ciphers (pp. 76--)
    • his matrix cipher
      • What's the message on p. 77?
      • Encode "The Jaws that bite, the claws that catch" using the matrix cipher.
    • Can you use his alphabet cipher?

  • For next time: Modern-day "codes": UPC codes