1. Circle, Triangle, Square → Towards → The Binary Number System

2. 1 place = 3, 1-shape patterns
Previously on CSP….
1 place = 3, 1-shape patterns
Who: baker
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3. 2 places = 9, 2-shape patterns
Previously on CSP….
2 places = 9, 2-shape patterns
Who: baker
@TeachCode | #TeacherCon | #CSforAll

4. 2 places = 9, 2-shape patterns
Previously on CSP….
2 places = 9, 2-shape patterns
Who: baker
@TeachCode | #TeacherCon | #CSforAll

5. 3 places = 27, 3-shape patterns
Previously on CSP….
3 places = 27, 3-shape patterns
Who: baker
@TeachCode | #TeacherCon | #CSforAll

6. 3 places = 27, 3-shape patterns
Previously on CSP….
3 places = 27, 3-shape patterns
Who: baker
@TeachCode | #TeacherCon | #CSforAll

7. Number each pattern to make a shape -> number mapping
Previously on CSP….
Number each pattern to make a shape -> number mapping 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26
Who: baker
@TeachCode | #TeacherCon | #CSforAll

8. What if we had 10 shapes? Previously on CSP….
Who: baker
@TeachCode | #TeacherCon | #CSforAll

9. 1 place = Ten 1-shape patterns
Previously on CSP….
1 place = Ten 1-shape patterns 1 2 3 4 5 6 7 8 9
← These are just shapes!
Who: baker
@TeachCode | #TeacherCon | #CSforAll

10. 0 9 9 _ _ _ Quiz: What comes next? Previously on CSP…. Ten shapes 1 21 2 3 4 5 6 7 8 9
0 9 9
_ _ _
Who: baker
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11. 0 9 9 _ _ _ 1 0 0 Quiz: What comes next? Previously on CSP….
Ten shapes 1 2 3 4 5 6 7 8 9
0 9 9
_ _ _
1 0 0
Who: baker
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12. Place Values... Previously on CSP….
Who: baker
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13. __ __ __ __ __ __ Place Values...
Previously on CSP….
Place Values...
With Ten “shapes” every time you add a place, you multiply by 10 the number of numbers... __
10 possibilities (0 - 9)
__ __
100 possibilities ( )
__ __ __
1000 possibilities ( )
Who: baker
@TeachCode | #TeacherCon | #CSforAll

14. __ __ __ __ __ __ Place Values...
Previously on CSP….
Place Values...
With Three “shapes” every time you add a place, you multiply by 3 the number of numbers... __
3 possibilities ( )
__ __
9 possibilities ( )
__ __ __
27 possibilities ( )
Who: baker
@TeachCode | #TeacherCon | #CSforAll

15. Four thousand and seventeen
Previously on CSP….
Write the number…
Four thousand and seventeen
Who: baker
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16. 4 0 1 7 Place Values...Remember what it means? Previously on CSP….
1000s s s s
4 * * * * 1
Who: baker
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17. Where is this heading? ...binary... Previously on CSP….
Who: baker
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18. 01 “Binary” is a number system with 2 shapes... Previously on CSP….
Who: baker
@TeachCode | #TeacherCon | #CSforAll

19. __ __ __ __ __ __ __ __ __ __ The pattern holds...
Previously on CSP….
The pattern holds...
With two “shapes” every time you add a place, you multiply by 2 the number of numbers... __
2 possibilities (0 1)
__ __
4 possibilities ( )
__ __ __
8 possibilities ( )
__ __ __ __
16 possibilities ( )
Who: baker
@TeachCode | #TeacherCon | #CSforAll

20. 1 1 0 1 Place Values...powers of 2 Previously on CSP…. 8s 4s 2s 1s
8s 4s 2s 1s
1 * * * * 1
= 13
Who: baker
@TeachCode | #TeacherCon | #CSforAll

21. Previously on CSP….
Constructing a binary number means figuring out which powers of 2 add up to the number you want
Who: baker
@TeachCode | #TeacherCon | #CSforAll

22. Previously on CSP….
Constructing a binary number means figuring out which powers of 2 add up to the number you want 32
= 41
Who: baker
@TeachCode | #TeacherCon | #CSforAll

23. To the flippy do! Previously on CSP….
Who: baker
@TeachCode | #TeacherCon | #CSforAll

24. Previously on CSP….
Flippy Do Quiz:
What’s the binary number? 5 17 63 64
100
127
What’s the decimal number?
100
101
1101
1 0000
Who: baker
@TeachCode | #TeacherCon | #CSforAll