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## Need

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**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**Freedom**http://www.youtube.com/watch?v=W1czBcnX1Ww**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**Bi-cycle**Bi-nary**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