Need

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?

Predicting New Jobs(per U.S. Bureau of Labor, 2008-2018)

Computer Specialists

Engineers, Social, Life

and Physical Scientists

• 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

Teaches how to use technology

Computer Theory

Teaches the ideas needed to create

technology

Music Performance: How to perform music

Music Theory: How to compose music

Binary Numbers:

The Basis of Computer Theory

Two Important Questions:

1. What are numbers, and what are they for?

2. What are decimal numbers?

3. What are binary numbers?

How Many Apples?

Numbers tell us “How Much”

2

2 3 4

What’s the symbol for This many?I’ll give you 5 seconds then I’ll call

on someone

One symbol, or two?

“12” Is TWO symbols,

not one

12

One Two

12 And21

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

926 629 296

962 692 269

This is not one symbol:

100

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

11, 0Ten Groups of

one in each group

11Ten Groups of

one-hundred in each group

Ten Groups of ten in each

group

Ten Groups of one-thousand 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

11, 0Two Groups of one in each

group

11Two Groups of four in each

group

Two Groups of two in each

group

Two Groups of eight in each

group

10

In Binary:

Get it?

we always use apples and oranges:

I thought:Why not Strawberries?

Why Fruit?Why not a Kiwi?

Quick Game

I’m going to ask you many kiwis you see.

You have 1 second

You can’t glance at this, you have to count

But this can be a pain

Easiest way to count is by forming GROUPS of equal size:

Easiest way to count is by forming GROUPS of equal size:

two groups of

ten

Three ones

So how many kiwis are there?

two groups of

ten

Three ones

In decimal there are 23

Kiwis

• I have to have ten symbols: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9

• But computers can ‘think’ as well as this washing machine:

They only want two symbols:

0, 1

Up Down

Light Dark

Down Up

North South

East West

Sadness Happiness

Open Closed

Winter Summer

2 − 2

Black White

Yellow Blue

What does this mean?

Vocabulary

How do we measure water in a bucket?

NUMBERS

• More graphics on opening My Computer

Filled with something like water in a bucket,

Instead of water molecules in a bucket, we have things called ‘bits’

BITH2O

BIT BIT BIT BIT BIT BIT BIT BIT

8 Bits

=

1 Byte

I would like to see how much memory is on

my flash drive

If I open my flash drive:

7.20 Giga-bytes

7.20 Giga-bytes= 7.20billion (giga) × 8bits/byte

≈60 billion bits

But we’re only going to work

with 5 bits today

Volunteers

Each person is a bit

Transfer to Interwrite

BTW,What does

“ZERO” mean?

Practice with various numbers

What’s the largest number I can make with 5 bits?

What’s the smallest number?

Switch to colored cards

Get a Scribe

Sixteens Eights Fours Twos Ones

Rules for Addition: On the white board

1 + 1 = 10

1 + 1 + 1 = 11

Fractions?