# Lecture 7

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27 Feb 2013
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November 13, 2012
Shape -> 2-D
Figure -> 3D
Rectangular prism
o Rectangle base --> named after this
o Opposite faces look exactly the same
All squares are rectangle (they have parallel sides)
o But all rectangles are not squares (they don't have equal sides)
Area of 12:
o
3 x 4
4x3
1x12
12x1
6x2
2x6
o Factor x factor = product
Communitive -> 3x4 = 4x3
6 groups of 2 = 2 + 2 + 2+ 2+ 2 + 2
o "groups of" = multiplying
30
o
1 x 30
30 x 1
2 x 15
15 x 2
3 x 10
10 x 3
5 x 6
6 x 5
7
o
1 x 7
7 x 1
Same situation for 13
These are prime numbers
Prime numbers
o To explain -> how many rectangles can you make with 13? 7?
o They can physically see that it only makes one rectangle (without flipping)
Base 10 blocks to represent 15 x 3 -> 15 = 10 + 5 (Junior grades)
o First number -> always length (5 x 2 is 5 length and 2 width)
o 3 10 blocks and 15 individual blocks
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