Need • Open big dag video • Slips of paper for voting • Prepare binary addition • Prepare lines for fractions • Rulers • Big cards • Little cards • Bucket • Warm-up: decimal multiplication and addition • Make boxes on white-board above the heads of the volunteers • Pencils
Agenda Talk about computer theory Talk about numbers Ask for volunteers to simulate a computer Play with cards
Agenda Talk about computers Talk about numbers Ask for volunteers to simulate a computer Play with cards
Computer Science Teacher’s Association • Google Workshop • Reasons I think computer science should be part of the curriculum • Our freedom might depend on it • Lots of Jobs • Compete with the Khan academy • Fun, understandable with the math-level that they teach in elementary school
I’m biased because I think it’s important, not because I know a lot about it. • Prefer chemistry
How do you feel about this? Scary? Interesting? Good? Bad?
But A LOT of our technology is created in Europe and Asia. • US government has to go outside the US to program, say, our defense systems.
Fun Part (well, in my opinion )
Information Technology Computer Theory Teaches the ideas needed to create technology Teaches how to use technology Music Performance: How to perform music Music Theory: How to compose music
Binary Numbers: The Basis of Computer Theory
Two Important Questions: • What are numbers, and what are they for? • What are decimal numbers? • What are binary numbers?
How Many Apples? Numbers tell us “How Much”
2 3 4
What’s the symbol for This many?I’ll give you 5 seconds then I’ll call on someone
“12” Is TWO symbols, not one
12 Two One
12 And 21 Use the same symbols. What makes them different numbers is their locations, or PLACES.
We have ten symbols in our decimal numbers, and we use them to build all the others: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9
Using the symbols 9, 2, and 6we can make twenty-four different numbers
But I wonder if our brains don’t learn to think of it as one thing, as a noun, maybe because of our language. 12
I don’t say “one group of ten and two ones.” I just say “twelve.” 12
Ten means this many ones: • Hundred means Ten Groups of Ten in each group • Thousand means Ten Groups of Ten groups of ten ones in each group • Ten thousand means ten Groups of ten groups of ten groups of ten ones in each group
1 1, 1 1 0 Ten Groupsof one-thousand in each group Ten Groups of one-hundred in each group Ten Groups of ten in each group Ten Groups of one in each group
Decimal Means Grouping by TENS
BINARY Means Grouping by TWO’S
Two means two ones: • Four mean Two Groups of Two in each group • Eight means Two Groups of Two groups of ten ones in each group • Sixteen means two Groups of two groups of two groups of two ones in each group
1 1, 1 1 0 Two Groupsof eight in each group Two Groups of four in each group Two Groups of two in each group Two Groups of one in each group
In Binary: 10
Quick Game I’m going to ask you many kiwis you see. You have 1 second