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Sexy Maths
1.
… what could
be less sexy than memorizing 4th grade multiplication facts?
2.
3.
4.
Surprise What is
6 6?
5.
Surprise What is
6 6? What is 5 7?
6.
Surprise What is
6 6? What is 5 7? 36 35
7.
Surprise What is
7 7?
8.
Surprise What is
7 7? What is 6 8? 49 48
9.
Surprise What is
8 8?
10.
Surprise What is
8 8? What is 7 9? 64 63
11.
Surprise What is
9 9?
12.
Surprise What is
9 9? What is 8 x 10?
13.
Surprise What is
9 9? What is 8 10? 81 80
14.
Is this always
true?
15.
Is this always
true? always one more than Is this number times itself
16.
Is this always
true? always one more than Is this number times itself the product of these two numbers?
17.
But why
does it work?!
18.
One way to
look at it 5 5
19.
One way to
look at it 5 4 Removing a column leaves
20.
One way to
look at it 6 4 Replacing as a row leaves with one left over.
21.
One way to
look at it 6 4 Removing the leftover leaves showing that it is one less than 5 5 .
22.
A second look
Removing a column leaves it narrower by 1.
23.
A second look
Replacing as a row leaves it narrower by 1 and taller by 1 (with 1 left over).
24.
25.
26.
27.
28.
29.
Experiment a moment
… or how 8 8 relates to 6 10…
30.
Experiment a moment
… or how 9 9 relates to 7 11…
31.
32.
33.
34.
Where does this
lead?
35.
36.
37.
38.
39.
Why does it
work? 47 3 50 53
40.
www 2 .edc.org/mathworkshop
Thanks! E. Paul Goldenberg [email_address] Contact Information
41.
www 2 .edc.org/mathworkshop
Bye! Thanks! E. Paul Goldenberg [email_address] Contact Information
Notas del editor
Back to the facts and skills.